The latest study on Business Headsets Market by Read Market Research provides a detailed summary and overview of the global market. The base year considered in this report is considered 2020 whereas information for 2021 is estimated and forecast from 2022 till 2027. The CAGR (Compound Annual Growth Rate) period of this report is 2021-2027. The Global Business Headsets Market is valued at USD XX Million in the year 2020 and is estimated to grow at USD XX Million by the end of year 2027.The report will shed light on very important growth aspect of Business Headsets and is a must have data for all the companies, investors, decision makers, top level executives and readers.
The segmental analysis of the report provides detailed analysis on Revenue, Growth, Forecast By Region, Type and Applications for the period 2016-2027.
The major vendors covered:
Plantronics
GN(Jabra)
Sennheiser
Microsoft
VXI
Logitech
ClearOne
Business Headsets Market Analysis By Type Segment:
USB Series Corded Headset
USB Series Bluetooth Headsets
Business Headsets Market Analysis By Application Segment:
Financial
Retail
Others
Business Headsets Market Analysis By Regions (Countries):
The Business Headsets Market has been thoroughly researched with the help of Primary and Secondary Research and has been validated by conduction interviews with industry experts across all the regions. As it is global study, we have included all the major regions.
Bottom Up approach has been used to derive and define the market size and shares of regions. Regions such as U.S., Canada, Germany, France, U.K., Italy, Russia, China, Japan, South Korea, India, Australia, Taiwan, Indonesia, Thailand, Malaysia, Philippines, Vietnam, Mexico, Brazil, Turkey, Saudi Arabia, U.A.E, etc. has been taken into consideration while deriving the market size and shares of regions.
Key Details of Regions and Countries of Business Headsets Report:
United States
China
European Union
Rest of World (Japan, Korea, India and Southeast Asia)
Key data provided:
Market Size of Regions
Market Share of Regions
Compound Annual Growth Rate (CAGR)
Historic Data From 2016-2020
Forecast Data From 2021-2027
Competitive Landscape of Business Headsets Market:
Business Headsets market competitive landscape analysis sheds light on the current market structure by players. The report will help the readers to understand some most important questions of the global market.
Key Questions Answered in Competitive Landscape-
Detailed information about Key Top Competitors in the Global Business Headsets Market
What is the expected Market size and growth rate of the Business Headsets market for the forecast period
Where is the largest and fastest growing market for Business Headsets market
How does the market relate to the overall economy, demography and other similar markets
What forces will shape the market going forward
Can I include additional segmentation / market segmentation
Business Headsets market global report answers all these questions and many more.
The study objectives are:
To analyze and research the Business Headsets Market status and future forecast.
To present the key Business Headsets Market analysis of companies and present revenue, market share, and recent development for key players.
To split the breakdown data by regions, type, companies and applications
To analyze the global and key regions market potential and advantage, opportunity and challenge, restraints and risks.
To identify significant trends, drivers, influence factors in global and regions
To analyze competitive developments such as expansions, agreements, new product launches, and acquisitions in the market
Frequently Asked Questions - FAQ:
How big is the opportunity for the Business Headsets market
Which are the recent industry development that can be implemented to generate additional revenue streams
Who are the major players operating in the Business Headsets market Which companies are the front runners
What are the major end-use industries of Business Headsets market
Table of Contents
1 Report Overview
1.1 Research Scope
1.2 Major Manufacturers Covered in This Report
1.3 Market Segment by Type
1.3.1 Global Business Headsets Market Size Growth Rate by Type (2021-2027)
1.3.2 USB Series Corded Headset
1.3.3 USB Series Bluetooth Headsets
1.4 Market Segment by Application
1.4.1 Global Business Headsets Market Share by Application (2021-2027)
1.4.2 Financial
1.4.3 Retail
1.4.4 Others
1.5 Study Objectives
1.6 Years Considered
2 Global Growth Trends
2.1 Production and Capacity Analysis
2.1.1 Global Business Headsets Production Value 2016-2027
2.1.2 Global Business Headsets Production 2016-2027
2.1.3 Global Business Headsets Capacity 2016-2027
2.1.4 Global Business Headsets Marketing Pricing and Trends
2.2 Key Producers Growth Rate (CAGR) 2021-2027
2.2.1 Global Business Headsets Market Size CAGR of Key Regions
2.2.2 Global Business Headsets Market Share of Key Regions
2.3 Industry Trends
2.3.1 Market Top Trends
2.3.2 Market Drivers
3 Market Share by Manufacturers
3.1 Capacity and Production by Manufacturers
3.1.1 Global Business Headsets Capacity by Manufacturers
3.1.2 Global Business Headsets Production by Manufacturers
3.2 Revenue by Manufacturers
3.2.1 Business Headsets Revenue by Manufacturers (2016-2020)
3.2.2 Business Headsets Revenue Share by Manufacturers (2016-2020)
3.2.3 Global Business Headsets Market Concentration Ratio (CR5 and HHI)
3.3 Business Headsets Price by Manufacturers
3.4 Key Manufacturers Business Headsets Plants/Factories Distribution and Area Served
3.5 Date of Key Manufacturers Enter into Business Headsets Market
3.6 Key Manufacturers Business Headsets Product Offered
3.7 Mergers & Acquisitions, Expansion Plans
4 Market Size by Type
4.1 Production and Production Value for Each Type
4.1.1 USB Series Corded Headset Production and Production Value (2016-2020)
4.1.2 USB Series Bluetooth Headsets Production and Production Value (2016-2020)
4.2 Global Business Headsets Production Market Share by Type
4.3 Global Business Headsets Production Value Market Share by Type
4.4 Business Headsets Ex-factory Price by Type
5 Market Size by Application
5.1 Overview
5.2 Global Business Headsets Consumption by Application
6 Production by Regions
6.1 Global Business Headsets Production (History Data) by Regions 2016-2020
6.2 Global Business Headsets Production Value (History Data) by Regions
6.3 United States
6.3.1 United States Business Headsets Production Growth Rate 2016-2020
6.3.2 United States Business Headsets Production Value Growth Rate 2016-2020
6.3.3 Key Players in United States
6.3.4 United States Business Headsets Import & Export
6.4 European Union
6.4.1 European Union Business Headsets Production Growth Rate 2016-2020
6.4.2 European Union Business Headsets Production Value Growth Rate 2016-2020
6.4.3 Key Players in European Union
6.4.4 European Union Business Headsets Import & Export
6.5 China
6.5.1 China Business Headsets Production Growth Rate 2016-2020
6.5.2 China Business Headsets Production Value Growth Rate 2016-2020
6.5.3 Key Players in China
6.5.4 China Business Headsets Import & Export
6.6 Rest of World
6.6.1 Japan
6.6.2 Korea
6.6.3 India
6.6.4 Southeast Asia
7 Business Headsets Consumption by Regions
7.1 Global Business Headsets Consumption (History Data) by Regions
7.2 United States
7.2.1 United States Business Headsets Consumption by Type
7.2.2 United States Business Headsets Consumption by Application
7.3 European Union
7.3.1 European Union Business Headsets Consumption by Type
7.3.2 European Union Business Headsets Consumption by Application
7.4 China
7.4.1 China Business Headsets Consumption by Type
7.4.2 China Business Headsets Consumption by Application
7.5 Rest of World
7.5.1 Rest of World Business Headsets Consumption by Type
7.5.2 Rest of World Business Headsets Consumption by Application
7.5.1 Japan
7.5.2 Korea
7.5.3 India
7.5.4 Southeast Asia
8 Company Profiles
8.1 Plantronics
8.1.1 Plantronics Company Details
8.1.2 Company Description and Business Overview
8.1.3 Production and Revenue of Business Headsets
8.1.4 Business Headsets Product Introduction
8.1.5 Plantronics Recent Development
8.2 GN(Jabra)
8.2.1 GN(Jabra) Company Details
8.2.2 Company Description and Business Overview
8.2.3 Production and Revenue of Business Headsets
8.2.4 Business Headsets Product Introduction
8.2.5 GN(Jabra) Recent Development
8.3 Sennheiser
8.3.1 Sennheiser Company Details
8.3.2 Company Description and Business Overview
8.3.3 Production and Revenue of Business Headsets
8.3.4 Business Headsets Product Introduction
8.3.5 Sennheiser Recent Development
8.4 Microsoft
8.4.1 Microsoft Company Details
8.4.2 Company Description and Business Overview
8.4.3 Production and Revenue of Business Headsets
8.4.4 Business Headsets Product Introduction
8.4.5 Microsoft Recent Development
8.5 VXI
8.5.1 VXI Company Details
8.5.2 Company Description and Business Overview
8.5.3 Production and Revenue of Business Headsets
8.5.4 Business Headsets Product Introduction
8.5.5 VXI Recent Development
8.6 Logitech
8.6.1 Logitech Company Details
8.6.2 Company Description and Business Overview
8.6.3 Production and Revenue of Business Headsets
8.6.4 Business Headsets Product Introduction
8.6.5 Logitech Recent Development
8.7 ClearOne
8.7.1 ClearOne Company Details
8.7.2 Company Description and Business Overview
8.7.3 Production and Revenue of Business Headsets
8.7.4 Business Headsets Product Introduction
8.7.5 ClearOne Recent Development
9 Market Forecast
9.1 Global Market Size Forecast
9.1.1 Global Business Headsets Capacity, Production Forecast 2021-2027
9.1.2 Global Business Headsets Production Value Forecast 2021-2027
9.2 Market Forecast by Regions
9.2.1 Global Business Headsets Production and Value Forecast by Regions 2021-2027
9.2.2 Global Business Headsets Consumption Forecast by Regions 2021-2027
9.3 United States
9.3.1 Production and Value Forecast in United States
9.3.2 Consumption Forecast in United States
9.4 European Union
9.4.1 Production and Value Forecast in European Union
9.4.2 Consumption Forecast in European Union
9.5 China
9.5.1 Production and Value Forecast in China
9.5.2 Consumption Forecast in China
9.6 Rest of World
9.6.1 Japan
9.6.2 Korea
9.6.3 India
9.6.4 Southeast Asia
9.7 Forecast by Type
9.7.1 Global Business Headsets Production Forecast by Type
9.7.2 Global Business Headsets Production Value Forecast by Type
9.8 Consumption Forecast by Application
10 Value Chain and Sales Channels Analysis
10.1 Value Chain Analysis
10.2 Sales Channels Analysis
10.2.1 Business Headsets Sales Channels
10.2.2 Business Headsets Distributors
10.3 Business Headsets Customers
11 Opportunities & Challenges, Threat and Affecting Factors
11.1 Market Opportunities
11.2 Market Challenges
11.3 Porter's Five Forces Analysis
12 Key Findings
13 Appendix
13.1 Research Methodology
13.1.1 Methodology/Research Approach
13.1.1.1 Research Programs/Design
13.1.1.2 Market Size Estimation
13.1.1.3 Market Breakdown and Data Triangulation
13.1.2 Data Source
13.1.2.1 Secondary Sources
13.1.2.2 Primary Sources
13.2 Author Details
13.3 Disclaimer
List of Tables and Figures
List of Tables and Figures
Figure Business Headsets Product Picture
Table Business Headsets Key Market Segments
Table Major Manufacturers Business Headsets Covered in This Report
Table Global Business Headsets Market Size Growth Rate by Type 2021-2027 (KUnits) & (Million US$)
Figure Global Business Headsets Sales Market Shar by Type 2016-2027
Figure USB Series Corded Headset Figures
Table Major Manufacturers of USB Series Corded Headset
Figure USB Series Bluetooth Headsets Figures
Table Major Manufacturers of USB Series Bluetooth Headsets
Table Global Business Headsets Market Share by Application 2021-2027 (KUnits)
Figure Financial Use Case
Figure Retail Use Case
Figure Others Use Case
Figure Business Headsets Report Years Considered
Figure Global Business Headsets Production Value Growth Rate 2016-2027 (Million US$)
Figure Global Business Headsets Production 2016-2027 (KUnits)
Figure Global Business Headsets Capacity 2016-2027 (KUnits)
Table Key Manufacturers Business Headsets Capacity (KUnits)
Figure Global Business Headsets Price 2016-2027 (USD/Unit)
Table Global Business Headsets Market Size of Key Regions (Million USD) & (KUnits)
Table Global Business Headsets Growth Rate of Key Regions 2021-2027 (Million USD)
Table Global Business Headsets Market Share for of Regions 2021-2027 (KUnits)
Table Market Top Trends
Table Global Business Headsets Capacity by Manufacturers (2016-2020) (KUnits)
Table Global Business Headsets Capacity Market Share by Manufacturers (2016-2020)
Table Global Business Headsets Production by Manufacturers (2016-2020) (KUnits)
Table Global Business Headsets Production Share by Manufacturers (2016-2020)
Figure Global Business Headsets Production Share by Manufacturers in 2020
Table Business Headsets Revenue by Manufacturers (2016-2020) (Million USD)
Table Business Headsets Revenue Share by Manufacturers (2016-2020)
Figure Business Headsets Value Share by Manufacturers in 2020
Table Global Business Headsets Manufacturers Market Concentration Ratio (CR5 and HHI)
Table Business Headsets Price by Manufacturers 2016-2020 (USD/Unit)
Table Key Manufacturers Business Headsets Plants/Factories Distribution
Table Key Manufacturers Business Headsets Area Served
Table Date of Key Manufacturers Enter into Business Headsets Market
Table Key Manufacturers Business Headsets Product Type
Table Mergers & Acquisitions, Expansion Plans
Table Global USB Series Corded Headset Production and Production Value (2016-2020) (KUnits) & (Million US$)
Table Global USB Series Bluetooth Headsets Production and Production Value (2016-2020) (KUnits) & (Million US$)
Table Global Business Headsets Production by Type (2016-2020) (KUnits)
Table Global Business Headsets Production Share by Type (2016-2020)
Figure Global Business Headsets Production Market Share by Type (2016-2020)
Figure Global Business Headsets Production Market Share by Type in 2020
Table Global Business Headsets Production Value by Type (2016-2020) (Million US$)
Table Global Business Headsets Production Value Share by Type (2016-2020)
Figure Global Business Headsets Production Value Market Share by Type (2016-2020)
Figure Global Business Headsets Production Value Market Share by Type in 2020
Table Business Headsets Ex-factory Price by Type 2016-2020 (USD/Unit)
Table Global Business Headsets Consumption by Application (2016-2020) (KUnits)
Table Global Business Headsets Consumption Share by Application (2016-2020)
Figure Global Consumption Business Headsets Market Share by Application (2016-2020)
Table Global Business Headsets Production by Regions 2016-2020 (KUnits)
Table Global Business Headsets Production Market Share by Regions 2016-2020
Figure Global Business Headsets Production Market Share by Regions 2016-2020
Figure Global Business Headsets Production Market Share by Regions in 2020
Table Global Business Headsets Production Value by Regions 2016-2020 (Million USD)
Table Global Business Headsets Production Value Market Share by Regions 2016-2020
Figure Global Business Headsets Production Value Market Share by Regions 2016-2020
Figure Global Business Headsets Production Value Market Share by Regions in 2020
Table United States Business Headsets Production and Value 2016-2020 (KUnits) & (Million USD)
Figure United States Business Headsets Production Growth Rate 2016-2020 (KUnits)
Figure United States Business Headsets Production Value Growth Rate 2016-2020 (Million USD)
Table United States Business Headsets Import & Export (KUnits)
Table European Union Business Headsets Production and Value 2016-2020 (KUnits) & (Million USD)
Figure European Union Business Headsets Production Growth Rate 2016-2020 (KUnits)
Figure European Union Business Headsets Production Value Growth Rate 2016-2020 (Million USD)
Table European Union Business Headsets Import & Export (KUnits)
Table China Business Headsets Production and Value 2016-2020 (KUnits) & (Million USD)
Figure China Business Headsets Production Growth Rate 2016-2020 (KUnits)
Figure China Business Headsets Production Value Growth Rate 2016-2020 (Million USD)
Table China Business Headsets Import & Export (KUnits)
Figure Japan Business Headsets Production Growth Rate 2016-2020 (KUnits)
Figure Japan Business Headsets Production Value Growth Rate 2016-2020 (Million USD)
Figure Korea Business Headsets Production Growth Rate 2016-2020 (KUnits)
Figure Korea Business Headsets Production Value Growth Rate 2016-2020 (Million USD)
Figure India Business Headsets Production Growth Rate 2016-2020 (KUnits)
Figure India Business Headsets Production Value Growth Rate 2016-2020 (Million USD)
Figure Southeast Asia Business Headsets Production Growth Rate 2016-2020 (KUnits)
Figure Southeast Asia Business Headsets Production Value Growth Rate 2016-2020 (Million USD)
Table Global Business Headsets Consumption by Regions 2016-2020 (KUnits)
Table Global Business Headsets Consumption Market Share by Regions 2016-2020
Figure Global Business Headsets Consumption Market Share by Regions 2016-2020
Figure Global Business Headsets Consumption Market Share by Regions in 2020
Figure United States Business Headsets Consumption Growth Rate (2016-2020) (KUnits)
Table United States Business Headsets Consumption by Type (2016-2020) (KUnits)
Figure United States Business Headsets Consumption Market Share by Type in 2020
Table United States Business Headsets Consumption by Application (2016-2020) (KUnits)
Figure United States Business Headsets Consumption Market Share by Application in 2020
Figure European Union Business Headsets Consumption Growth Rate (2016-2020) (KUnits)
Table European Union Business Headsets Consumption by Type (2016-2020) (KUnits)
Figure European Union Business Headsets Consumption Market Share by Type in 2020
Table European Union Business Headsets Consumption by Application (2016-2020) (KUnits)
Figure European Union Business Headsets Consumption Market Share by Application in 2020
Figure China Business Headsets Consumption Growth Rate (2016-2020) (KUnits)
Table China Business Headsets Consumption by Type (2016-2020) (KUnits)
Figure China Business Headsets Consumption Market Share by Type in 2020
Table China Business Headsets Consumption by Application (2016-2020) (KUnits)
Figure China Business Headsets Consumption Market Share by Application in 2020
Figure Rest of World Business Headsets Consumption Growth Rate (2016-2020) (KUnits)
Table Rest of World Business Headsets Consumption by Type (2016-2020) (KUnits)
Figure Rest of World Business Headsets Consumption Market Share by Type in 2020
Table Rest of World Business Headsets Consumption by Application (2016-2020) (KUnits)
Figure Rest of World Business Headsets Consumption Market Share by Application in 2020
Figure Japan Business Headsets Consumption Growth Rate (2016-2020) (KUnits)
Figure Korea Business Headsets Consumption Growth Rate (2016-2020) (KUnits)
Figure India Business Headsets Consumption Growth Rate (2016-2020) (KUnits)
Figure Southeast Asia Business Headsets Consumption Growth Rate (2016-2020) (KUnits)
Table Plantronics Company Details
Table Plantronics Description and Business Overview
Table Plantronics Business Headsets Production (KUnits), Revenue (Million US$), Price (USD/Unit) and Gross Margin (2016-2020)
Table Plantronics Business Headsets Production Growth Rate (2016-2020)
Table Plantronics Business Headsets Production Market Share in Global Market
Table Plantronics Recent Development
Table GN(Jabra) Company Details
Table GN(Jabra) Description and Business Overview
Table GN(Jabra) Business Headsets Production (KUnits), Revenue (Million US$), Price (USD/Unit) and Gross Margin (2016-2020)
Table GN(Jabra) Business Headsets Production Growth Rate (2016-2020)
Table GN(Jabra) Business Headsets Production Market Share in Global Market
Table GN(Jabra) Recent Development
Table Sennheiser Company Details
Table Sennheiser Description and Business Overview
Table Sennheiser Business Headsets Production (KUnits), Revenue (Million US$), Price (USD/Unit) and Gross Margin (2016-2020)
Table Sennheiser Business Headsets Production Growth Rate (2016-2020)
Table Sennheiser Business Headsets Production Market Share in Global Market
Table Sennheiser Recent Development
Table Microsoft Company Details
Table Microsoft Description and Business Overview
Table Microsoft Business Headsets Production (KUnits), Revenue (Million US$), Price (USD/Unit) and Gross Margin (2016-2020)
Table Microsoft Business Headsets Production Growth Rate (2016-2020)
Table Microsoft Business Headsets Production Market Share in Global Market
Table Microsoft Recent Development
Table VXI Company Details
Table VXI Description and Business Overview
Table VXI Business Headsets Production (KUnits), Revenue (Million US$), Price (USD/Unit) and Gross Margin (2016-2020)
Table VXI Business Headsets Production Growth Rate (2016-2020)
Table VXI Business Headsets Production Market Share in Global Market
Table VXI Recent Development
Table Logitech Company Details
Table Logitech Description and Business Overview
Table Logitech Business Headsets Production (KUnits), Revenue (Million US$), Price (USD/Unit) and Gross Margin (2016-2020)
Table Logitech Business Headsets Production Growth Rate (2016-2020)
Table Logitech Business Headsets Production Market Share in Global Market
Table Logitech Recent Development
Table ClearOne Company Details
Table ClearOne Description and Business Overview
Table ClearOne Business Headsets Production (KUnits), Revenue (Million US$), Price (USD/Unit) and Gross Margin (2016-2020)
Table ClearOne Business Headsets Production Growth Rate (2016-2020)
Table ClearOne Business Headsets Production Market Share in Global Market
Table ClearOne Recent Development
Table Global Business Headsets Capacity, Production Forecast 2021-2027 (KUnits)
Figure Global Business Headsets Capacity Forecast 2021-2027 (KUnits)
Figure Global Business Headsets Production Forecast 2021-2027 (KUnits)
Figure Global Business Headsets Production Value Forecast 2021-2027 (Million US$)
Table Global Business Headsets Production Value Forecast 2021-2027 (Million US$)
Table Global Business Headsets Production Forecast by Regions 2021-2027 (KUnits)
Table Global Business Headsets Production Market Share Forecast by Regions 2021-2027
Table Global Business Headsets Production Value Forecast by Regions 2021-2027 (Million US$)
Table Global Business Headsets Consumption Forecast by Regions 2021-2027 (KUnits)
Table Global Business Headsets Consumption Market Share Forecast by Regions 2021-2027
Table United States Business Headsets Production and Production Value Forecast 2021-2027 (KUnits) & (Million US$)
Figure United States Business Headsets Production Growth Forecast 2021-2027 (KUnits)
Table United States Business Headsets Production Value Forecast 2021-2027 (Million US$)
Figure United States Business Headsets Consumption Forecast 2021-2027 (KUnits)
Table European Union Business Headsets Production and Production Value Forecast 2021-2027 (KUnits) & (Million US$)
Figure European Union Business Headsets Production Growth Forecast 2021-2027 (KUnits)
Table European Union Business Headsets Production Value Forecast 2021-2027 (Million US$)
Figure European Union Business Headsets Consumption Forecast 2021-2027 (KUnits)
Table China Business Headsets Production and Production Value Forecast 2021-2027 (KUnits) & (Million US$)
Figure China Business Headsets Production Growth Forecast 2021-2027 (KUnits)
Table China Business Headsets Production Value Forecast 2021-2027 (Million US$)
Figure China Business Headsets Consumption Forecast 2021-2027 (KUnits)
Figure Japan Business Headsets Production Growth Forecast 2021-2027 (KUnits)
Figure Japan Business Headsets Consumption Forecast 2021-2027 (KUnits)
Figure Korea Business Headsets Production Growth Forecast 2021-2027 (KUnits)
Figure Korea Business Headsets Consumption Forecast 2021-2027 (KUnits)
Figure India Business Headsets Production Growth Forecast 2021-2027 (KUnits)
Figure India Business Headsets Consumption Forecast 2021-2027 (KUnits)
Figure Southeast Asia Business Headsets Production Growth Forecast 2021-2027 (KUnits)
Figure Southeast Asia Business Headsets Consumption Forecast 2021-2027 (KUnits)
Table Global Business Headsets Production Forecast by Type 2021-2027 (KUnits)
Figure Global Business Headsets Production Forecast by Type 2021-2027 (KUnits)
Figure Global Business Headsets Production Market Share Forecast by Type 2021-2027
Table Global Business Headsets Production Value Forecast by Type 2021-2027 (Million US$)
Figure Global Business Headsets Production Value Forecast by Type 2021-2027 (Million US$)
Figure Global Business Headsets Production Value Market Share Forecast by Type 2021-2027
Table Global Business Headsets Consumption Forecast by Application 2021-2027 (KUnits)
Figure Global Business Headsets Consumption Forecast by Application 2021-2027 (KUnits)
Figure Global Business Headsets Consumption Market Share Forecast by Application 2021-2027
Figure Business Headsets Value Chain
Table Business Headsets Distributors List
Table Business Headsets Customers List
Table Porter's Five Forces Analysis
Table Research Programs/Design for This Report
Figure Bottom-up and Top-down Approaches for This Report
Figure Data Triangulation
Table Key Data Information from Secondary Sources
Table Key Data Information from Primary Sources