Não informado. Public Health Service Publications. U.S. Department of Health Education and Welfare.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Public Health Service Publications. Washington: U.S. Department of Health Education and Welfare.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Public Health Service Publications. U.S. Department of Health Education and Welfare.
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