Não informado. (1971). American Family Physician. American Academy of Family Physicians.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. American Family Physician. Kansas City, Kan: American Academy of Family Physicians, 1971.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. American Family Physician. American Academy of Family Physicians, 1971.
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