Não informado. (1940). Labor market and employment security. Bureau of Employment Security.
Chicago-referens (17:e uppl.)Não informado. Labor Market and Employment Security. Washington: Bureau of Employment Security, 1940.
MLA-referens (8:e uppl.)Não informado. Labor Market and Employment Security. Bureau of Employment Security, 1940.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.