Não informado. (1971). American Family Physician. American Academy of Family Physicians.
Citação do estilo Chicago (17ª ed.)Não informado. American Family Physician. Kansas City, Kan: American Academy of Family Physicians, 1971.
Citação MLA (8ª ed.)Não informado. American Family Physician. American Academy of Family Physicians, 1971.
Предупреждение: эти цитированмия не могут быть всегда правильны на 100%.