Não informado. (1971). Nation's Health. American Public Health Association.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Nation's Health. New York: American Public Health Association, 1971.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Nation's Health. American Public Health Association, 1971.
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