Não informado. (1940). Labor market and employment security. Bureau of Employment Security.
Chicago-Zitierstil (17. Ausg.)Não informado. Labor Market and Employment Security. Washington: Bureau of Employment Security, 1940.
MLA-Zitierstil (8. Ausg.)Não informado. Labor Market and Employment Security. Bureau of Employment Security, 1940.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.