APA-referens (7:e uppl.)
(1949). Experience with Human Factors in Agricultural Areas of the World. Extension Service, U.S. Department of Agriculture,.
Chicago-referens (17:e uppl.)
Experience with Human Factors in Agricultural Areas of the World. Washington, D.C.: Extension Service, U.S. Department of Agriculture,, 1949.
MLA-referens (9:e uppl.)
Experience with Human Factors in Agricultural Areas of the World. Extension Service, U.S. Department of Agriculture,, 1949.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.