Não informado. (1971). American Family Physician. American Academy of Family Physicians.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. American Family Physician. Kansas City, Kan: American Academy of Family Physicians, 1971.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. American Family Physician. American Academy of Family Physicians, 1971.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.