Cranstone, B. (1987). Why are pigs (and some other animals) not milked? Anthropological Society of Oxford.
Chicago-referens (17:e uppl.)Cranstone, BAL. Why Are Pigs (and Some Other Animals) Not Milked? Anthropological Society of Oxford, 1987.
MLA-referens (9:e uppl.)Cranstone, BAL. Why Are Pigs (and Some Other Animals) Not Milked? Anthropological Society of Oxford, 1987.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.