Não informado. (1923). Farm economics. Cornell University, New York State College of Agriculture.
Chicago-referens (17:e uppl.)Não informado. Farm Economics. Ithaca, NY: Cornell University, New York State College of Agriculture, 1923.
MLA-referens (8:e uppl.)Não informado. Farm Economics. Cornell University, New York State College of Agriculture, 1923.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.