Não informado. (1971). American Family Physician. American Academy of Family Physicians.
শিকাগো স্টাইল (17 তম সংস্করণ) উদ্ধৃতিNão informado. American Family Physician. Kansas City, Kan: American Academy of Family Physicians, 1971.
M.L.A (8 ম সংস্করণ) উদ্ধৃতিNão informado. American Family Physician. American Academy of Family Physicians, 1971.
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