Não informado. (1961). American Family Physician. American Academy of General Practice.
Chicago-referens (17:e uppl.)Não informado. American Family Physician. Kansas City, Kan: American Academy of General Practice, 1961.
MLA-referens (8:e uppl.)Não informado. American Family Physician. American Academy of General Practice, 1961.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.