• Productivity Statistics Portal, OECD

• Global Forum on Productivity, OECD

• Productivity Statistics, Trading Economics

• International Labor Comparisons, The Conference Board

• Productivity Statistics, U.S. Bureau of Labor Statistics

• The Vienna Institute for International Economic Studies

• The Groningen Growth and Development Centre

• Fundación de Estudios de Economía Aplicada, Fedea

• Instituto Valenciano de Investigaciones Económicas, Ivie

• The Institute for Strategy and Competitiveness, HBS

• World Competitiveness Center, IMD

• Council of Competitiveness

• Instituto Vasco de Competitividad-Fundación Deusto

• International Journal of Productivity and Performance Management

• Lean Enterprise Research Center, LERC Cardiff

• World Confederation of Productivity Science

• American Productivity & Quality Center

• The Center for Measuring University Performance

• Asian Productivity Organisation

• Balanced Scorecard Institute

• Business Process Trends

• Business Models Inc.

• Interaction Design Foundation

• Exceltur

• Instituto de Turismo y Desarrollo Económico Sostenible (Tides)