| Auteur | Pertinence |
| Study Group on International Labor and Working Class History |
30 |
| American Federation of Labor |
5 |
| Austrian Labor Committee |
3 |
| USA |
3 |
| USA Bureau of Foreign and Domestic Commerce |
3 |
| USA Department of Commerce and Labor Bureau of Statistics |
3 |
| USA. Bureau of the Census |
3 |
| USA. Congress. House of Representatives |
3 |
| American Bar Association. Section of Labor and Employment Law |
2 |
| American Labor Conference on International Affairs |
2 |
| Polish Labor Group |
2 |
| USA Department of Labor |
2 |
| Adam Matthew Digital |
1 |
| American Federation of Labor Free Trade Union Committee |
1 |
| American Federation of Labor and Congress of Industrial Organizations |
1 |
| Bell, Linda A., 1959- 1959- |
1 |
| Bojadžijev, Manuela 1971- |
1 |
| British Library |
1 |
| Chase, Stuart 1888-1985 |
1 |
| Conference on Labor Markets in Developing Countries ((1994, Washington, D.C.)) |
1 |
