Não informado. (1894). Circular. U.S. Department of Agriculture, Bureau of Animal Industry.
Chicago-referens (17:e uppl.)Não informado. Circular. Washington: U.S. Department of Agriculture, Bureau of Animal Industry, 1894.
MLA-referens (8:e uppl.)Não informado. Circular. U.S. Department of Agriculture, Bureau of Animal Industry, 1894.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.