The latest study on UC 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 UC 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 UC 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
UC Headsets Market Analysis By Type Segment:
USB Series Corded Headset
USB Series Bluetooth Headsets
UC Headsets Market Analysis By Application Segment:
Financial
Retail
Others
UC Headsets Market Analysis By Regions (Countries):
The UC 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 UC 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 UC Headsets Market:
UC 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 UC Headsets Market
What is the expected Market size and growth rate of the UC Headsets market for the forecast period
Where is the largest and fastest growing market for UC 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
UC Headsets market global report answers all these questions and many more.
The study objectives are:
To analyze and research the UC Headsets Market status and future forecast.
To present the key UC 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 UC 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 UC Headsets market Which companies are the front runners
What are the major end-use industries of UC 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 UC 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 UC 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 UC Headsets Production Value 2016-2027
2.1.2 Global UC Headsets Production 2016-2027
2.1.3 Global UC Headsets Capacity 2016-2027
2.1.4 Global UC Headsets Marketing Pricing and Trends
2.2 Key Producers Growth Rate (CAGR) 2021-2027
2.2.1 Global UC Headsets Market Size CAGR of Key Regions
2.2.2 Global UC 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 UC Headsets Capacity by Manufacturers
3.1.2 Global UC Headsets Production by Manufacturers
3.2 Revenue by Manufacturers
3.2.1 UC Headsets Revenue by Manufacturers (2016-2020)
3.2.2 UC Headsets Revenue Share by Manufacturers (2016-2020)
3.2.3 Global UC Headsets Market Concentration Ratio (CR5 and HHI)
3.3 UC Headsets Price by Manufacturers
3.4 Key Manufacturers UC Headsets Plants/Factories Distribution and Area Served
3.5 Date of Key Manufacturers Enter into UC Headsets Market
3.6 Key Manufacturers UC 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 UC Headsets Production Market Share by Type
4.3 Global UC Headsets Production Value Market Share by Type
4.4 UC Headsets Ex-factory Price by Type
5 Market Size by Application
5.1 Overview
5.2 Global UC Headsets Consumption by Application
6 Production by Regions
6.1 Global UC Headsets Production (History Data) by Regions 2016-2020
6.2 Global UC Headsets Production Value (History Data) by Regions
6.3 United States
6.3.1 United States UC Headsets Production Growth Rate 2016-2020
6.3.2 United States UC Headsets Production Value Growth Rate 2016-2020
6.3.3 Key Players in United States
6.3.4 United States UC Headsets Import & Export
6.4 European Union
6.4.1 European Union UC Headsets Production Growth Rate 2016-2020
6.4.2 European Union UC Headsets Production Value Growth Rate 2016-2020
6.4.3 Key Players in European Union
6.4.4 European Union UC Headsets Import & Export
6.5 China
6.5.1 China UC Headsets Production Growth Rate 2016-2020
6.5.2 China UC Headsets Production Value Growth Rate 2016-2020
6.5.3 Key Players in China
6.5.4 China UC 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 UC Headsets Consumption by Regions
7.1 Global UC Headsets Consumption (History Data) by Regions
7.2 United States
7.2.1 United States UC Headsets Consumption by Type
7.2.2 United States UC Headsets Consumption by Application
7.3 European Union
7.3.1 European Union UC Headsets Consumption by Type
7.3.2 European Union UC Headsets Consumption by Application
7.4 China
7.4.1 China UC Headsets Consumption by Type
7.4.2 China UC Headsets Consumption by Application
7.5 Rest of World
7.5.1 Rest of World UC Headsets Consumption by Type
7.5.2 Rest of World UC 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 UC Headsets
8.1.4 UC 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 UC Headsets
8.2.4 UC 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 UC Headsets
8.3.4 UC 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 UC Headsets
8.4.4 UC 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 UC Headsets
8.5.4 UC 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 UC Headsets
8.6.4 UC 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 UC Headsets
8.7.4 UC Headsets Product Introduction
8.7.5 ClearOne Recent Development
9 Market Forecast
9.1 Global Market Size Forecast
9.1.1 Global UC Headsets Capacity, Production Forecast 2021-2027
9.1.2 Global UC Headsets Production Value Forecast 2021-2027
9.2 Market Forecast by Regions
9.2.1 Global UC Headsets Production and Value Forecast by Regions 2021-2027
9.2.2 Global UC 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 UC Headsets Production Forecast by Type
9.7.2 Global UC 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 UC Headsets Sales Channels
10.2.2 UC Headsets Distributors
10.3 UC 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 UC Headsets Product Picture
Table UC Headsets Key Market Segments
Table Major Manufacturers UC Headsets Covered in This Report
Table Global UC Headsets Market Size Growth Rate by Type 2021-2027 (KUnits) & (Million US$)
Figure Global UC Headsets Sales Market Shar by Type 2016-2027
Figure USB Series Corded Headset Figures
Table Major Manufacturers of USB Series Corded Headset
Figure USB Series Bluetooth Headsets Figures
Table Major Manufacturers of USB Series Bluetooth Headsets
Table Global UC Headsets Market Share by Application 2021-2027 (KUnits)
Figure Financial Use Case
Figure Retail Use Case
Figure Others Use Case
Figure UC Headsets Report Years Considered
Figure Global UC Headsets Production Value Growth Rate 2016-2027 (Million US$)
Figure Global UC Headsets Production 2016-2027 (KUnits)
Figure Global UC Headsets Capacity 2016-2027 (KUnits)
Table Key Manufacturers UC Headsets Capacity (KUnits)
Figure Global UC Headsets Price 2016-2027 (USD/Unit)
Table Global UC Headsets Market Size of Key Regions (Million USD) & (KUnits)
Table Global UC Headsets Growth Rate of Key Regions 2021-2027 (Million USD)
Table Global UC Headsets Market Share for of Regions 2021-2027 (KUnits)
Table Market Top Trends
Table Global UC Headsets Capacity by Manufacturers (2016-2020) (KUnits)
Table Global UC Headsets Capacity Market Share by Manufacturers (2016-2020)
Table Global UC Headsets Production by Manufacturers (2016-2020) (KUnits)
Table Global UC Headsets Production Share by Manufacturers (2016-2020)
Figure Global UC Headsets Production Share by Manufacturers in 2020
Table UC Headsets Revenue by Manufacturers (2016-2020) (Million USD)
Table UC Headsets Revenue Share by Manufacturers (2016-2020)
Figure UC Headsets Value Share by Manufacturers in 2020
Table Global UC Headsets Manufacturers Market Concentration Ratio (CR5 and HHI)
Table UC Headsets Price by Manufacturers 2016-2020 (USD/Unit)
Table Key Manufacturers UC Headsets Plants/Factories Distribution
Table Key Manufacturers UC Headsets Area Served
Table Date of Key Manufacturers Enter into UC Headsets Market
Table Key Manufacturers UC 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 UC Headsets Production by Type (2016-2020) (KUnits)
Table Global UC Headsets Production Share by Type (2016-2020)
Figure Global UC Headsets Production Market Share by Type (2016-2020)
Figure Global UC Headsets Production Market Share by Type in 2020
Table Global UC Headsets Production Value by Type (2016-2020) (Million US$)
Table Global UC Headsets Production Value Share by Type (2016-2020)
Figure Global UC Headsets Production Value Market Share by Type (2016-2020)
Figure Global UC Headsets Production Value Market Share by Type in 2020
Table UC Headsets Ex-factory Price by Type 2016-2020 (USD/Unit)
Table Global UC Headsets Consumption by Application (2016-2020) (KUnits)
Table Global UC Headsets Consumption Share by Application (2016-2020)
Figure Global Consumption UC Headsets Market Share by Application (2016-2020)
Table Global UC Headsets Production by Regions 2016-2020 (KUnits)
Table Global UC Headsets Production Market Share by Regions 2016-2020
Figure Global UC Headsets Production Market Share by Regions 2016-2020
Figure Global UC Headsets Production Market Share by Regions in 2020
Table Global UC Headsets Production Value by Regions 2016-2020 (Million USD)
Table Global UC Headsets Production Value Market Share by Regions 2016-2020
Figure Global UC Headsets Production Value Market Share by Regions 2016-2020
Figure Global UC Headsets Production Value Market Share by Regions in 2020
Table United States UC Headsets Production and Value 2016-2020 (KUnits) & (Million USD)
Figure United States UC Headsets Production Growth Rate 2016-2020 (KUnits)
Figure United States UC Headsets Production Value Growth Rate 2016-2020 (Million USD)
Table United States UC Headsets Import & Export (KUnits)
Table European Union UC Headsets Production and Value 2016-2020 (KUnits) & (Million USD)
Figure European Union UC Headsets Production Growth Rate 2016-2020 (KUnits)
Figure European Union UC Headsets Production Value Growth Rate 2016-2020 (Million USD)
Table European Union UC Headsets Import & Export (KUnits)
Table China UC Headsets Production and Value 2016-2020 (KUnits) & (Million USD)
Figure China UC Headsets Production Growth Rate 2016-2020 (KUnits)
Figure China UC Headsets Production Value Growth Rate 2016-2020 (Million USD)
Table China UC Headsets Import & Export (KUnits)
Figure Japan UC Headsets Production Growth Rate 2016-2020 (KUnits)
Figure Japan UC Headsets Production Value Growth Rate 2016-2020 (Million USD)
Figure Korea UC Headsets Production Growth Rate 2016-2020 (KUnits)
Figure Korea UC Headsets Production Value Growth Rate 2016-2020 (Million USD)
Figure India UC Headsets Production Growth Rate 2016-2020 (KUnits)
Figure India UC Headsets Production Value Growth Rate 2016-2020 (Million USD)
Figure Southeast Asia UC Headsets Production Growth Rate 2016-2020 (KUnits)
Figure Southeast Asia UC Headsets Production Value Growth Rate 2016-2020 (Million USD)
Table Global UC Headsets Consumption by Regions 2016-2020 (KUnits)
Table Global UC Headsets Consumption Market Share by Regions 2016-2020
Figure Global UC Headsets Consumption Market Share by Regions 2016-2020
Figure Global UC Headsets Consumption Market Share by Regions in 2020
Figure United States UC Headsets Consumption Growth Rate (2016-2020) (KUnits)
Table United States UC Headsets Consumption by Type (2016-2020) (KUnits)
Figure United States UC Headsets Consumption Market Share by Type in 2020
Table United States UC Headsets Consumption by Application (2016-2020) (KUnits)
Figure United States UC Headsets Consumption Market Share by Application in 2020
Figure European Union UC Headsets Consumption Growth Rate (2016-2020) (KUnits)
Table European Union UC Headsets Consumption by Type (2016-2020) (KUnits)
Figure European Union UC Headsets Consumption Market Share by Type in 2020
Table European Union UC Headsets Consumption by Application (2016-2020) (KUnits)
Figure European Union UC Headsets Consumption Market Share by Application in 2020
Figure China UC Headsets Consumption Growth Rate (2016-2020) (KUnits)
Table China UC Headsets Consumption by Type (2016-2020) (KUnits)
Figure China UC Headsets Consumption Market Share by Type in 2020
Table China UC Headsets Consumption by Application (2016-2020) (KUnits)
Figure China UC Headsets Consumption Market Share by Application in 2020
Figure Rest of World UC Headsets Consumption Growth Rate (2016-2020) (KUnits)
Table Rest of World UC Headsets Consumption by Type (2016-2020) (KUnits)
Figure Rest of World UC Headsets Consumption Market Share by Type in 2020
Table Rest of World UC Headsets Consumption by Application (2016-2020) (KUnits)
Figure Rest of World UC Headsets Consumption Market Share by Application in 2020
Figure Japan UC Headsets Consumption Growth Rate (2016-2020) (KUnits)
Figure Korea UC Headsets Consumption Growth Rate (2016-2020) (KUnits)
Figure India UC Headsets Consumption Growth Rate (2016-2020) (KUnits)
Figure Southeast Asia UC Headsets Consumption Growth Rate (2016-2020) (KUnits)
Table Plantronics Company Details
Table Plantronics Description and Business Overview
Table Plantronics UC Headsets Production (KUnits), Revenue (Million US$), Price (USD/Unit) and Gross Margin (2016-2020)
Table Plantronics UC Headsets Production Growth Rate (2016-2020)
Table Plantronics UC 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) UC Headsets Production (KUnits), Revenue (Million US$), Price (USD/Unit) and Gross Margin (2016-2020)
Table GN(Jabra) UC Headsets Production Growth Rate (2016-2020)
Table GN(Jabra) UC Headsets Production Market Share in Global Market
Table GN(Jabra) Recent Development
Table Sennheiser Company Details
Table Sennheiser Description and Business Overview
Table Sennheiser UC Headsets Production (KUnits), Revenue (Million US$), Price (USD/Unit) and Gross Margin (2016-2020)
Table Sennheiser UC Headsets Production Growth Rate (2016-2020)
Table Sennheiser UC Headsets Production Market Share in Global Market
Table Sennheiser Recent Development
Table Microsoft Company Details
Table Microsoft Description and Business Overview
Table Microsoft UC Headsets Production (KUnits), Revenue (Million US$), Price (USD/Unit) and Gross Margin (2016-2020)
Table Microsoft UC Headsets Production Growth Rate (2016-2020)
Table Microsoft UC Headsets Production Market Share in Global Market
Table Microsoft Recent Development
Table VXI Company Details
Table VXI Description and Business Overview
Table VXI UC Headsets Production (KUnits), Revenue (Million US$), Price (USD/Unit) and Gross Margin (2016-2020)
Table VXI UC Headsets Production Growth Rate (2016-2020)
Table VXI UC Headsets Production Market Share in Global Market
Table VXI Recent Development
Table Logitech Company Details
Table Logitech Description and Business Overview
Table Logitech UC Headsets Production (KUnits), Revenue (Million US$), Price (USD/Unit) and Gross Margin (2016-2020)
Table Logitech UC Headsets Production Growth Rate (2016-2020)
Table Logitech UC Headsets Production Market Share in Global Market
Table Logitech Recent Development
Table ClearOne Company Details
Table ClearOne Description and Business Overview
Table ClearOne UC Headsets Production (KUnits), Revenue (Million US$), Price (USD/Unit) and Gross Margin (2016-2020)
Table ClearOne UC Headsets Production Growth Rate (2016-2020)
Table ClearOne UC Headsets Production Market Share in Global Market
Table ClearOne Recent Development
Table Global UC Headsets Capacity, Production Forecast 2021-2027 (KUnits)
Figure Global UC Headsets Capacity Forecast 2021-2027 (KUnits)
Figure Global UC Headsets Production Forecast 2021-2027 (KUnits)
Figure Global UC Headsets Production Value Forecast 2021-2027 (Million US$)
Table Global UC Headsets Production Value Forecast 2021-2027 (Million US$)
Table Global UC Headsets Production Forecast by Regions 2021-2027 (KUnits)
Table Global UC Headsets Production Market Share Forecast by Regions 2021-2027
Table Global UC Headsets Production Value Forecast by Regions 2021-2027 (Million US$)
Table Global UC Headsets Consumption Forecast by Regions 2021-2027 (KUnits)
Table Global UC Headsets Consumption Market Share Forecast by Regions 2021-2027
Table United States UC Headsets Production and Production Value Forecast 2021-2027 (KUnits) & (Million US$)
Figure United States UC Headsets Production Growth Forecast 2021-2027 (KUnits)
Table United States UC Headsets Production Value Forecast 2021-2027 (Million US$)
Figure United States UC Headsets Consumption Forecast 2021-2027 (KUnits)
Table European Union UC Headsets Production and Production Value Forecast 2021-2027 (KUnits) & (Million US$)
Figure European Union UC Headsets Production Growth Forecast 2021-2027 (KUnits)
Table European Union UC Headsets Production Value Forecast 2021-2027 (Million US$)
Figure European Union UC Headsets Consumption Forecast 2021-2027 (KUnits)
Table China UC Headsets Production and Production Value Forecast 2021-2027 (KUnits) & (Million US$)
Figure China UC Headsets Production Growth Forecast 2021-2027 (KUnits)
Table China UC Headsets Production Value Forecast 2021-2027 (Million US$)
Figure China UC Headsets Consumption Forecast 2021-2027 (KUnits)
Figure Japan UC Headsets Production Growth Forecast 2021-2027 (KUnits)
Figure Japan UC Headsets Consumption Forecast 2021-2027 (KUnits)
Figure Korea UC Headsets Production Growth Forecast 2021-2027 (KUnits)
Figure Korea UC Headsets Consumption Forecast 2021-2027 (KUnits)
Figure India UC Headsets Production Growth Forecast 2021-2027 (KUnits)
Figure India UC Headsets Consumption Forecast 2021-2027 (KUnits)
Figure Southeast Asia UC Headsets Production Growth Forecast 2021-2027 (KUnits)
Figure Southeast Asia UC Headsets Consumption Forecast 2021-2027 (KUnits)
Table Global UC Headsets Production Forecast by Type 2021-2027 (KUnits)
Figure Global UC Headsets Production Forecast by Type 2021-2027 (KUnits)
Figure Global UC Headsets Production Market Share Forecast by Type 2021-2027
Table Global UC Headsets Production Value Forecast by Type 2021-2027 (Million US$)
Figure Global UC Headsets Production Value Forecast by Type 2021-2027 (Million US$)
Figure Global UC Headsets Production Value Market Share Forecast by Type 2021-2027
Table Global UC Headsets Consumption Forecast by Application 2021-2027 (KUnits)
Figure Global UC Headsets Consumption Forecast by Application 2021-2027 (KUnits)
Figure Global UC Headsets Consumption Market Share Forecast by Application 2021-2027
Figure UC Headsets Value Chain
Table UC Headsets Distributors List
Table UC 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