Não informado. (1971). American Family Physician. American Academy of Family Physicians.
Chicago-Zitierstil (17. Ausg.)Não informado. American Family Physician. Kansas City, Kan: American Academy of Family Physicians, 1971.
MLA-Zitierstil (8. Ausg.)Não informado. American Family Physician. American Academy of Family Physicians, 1971.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.