Clark, D. W. (1981). Preventive and community medicine (2ª ed.). Little, Brown.
Chicago Style (17th ed.) CitationClark, Duncan W. Preventive and Community Medicine. 2ª ed. Little, Brown, 1981.
MLA (9th ed.) CitationClark, Duncan W. Preventive and Community Medicine. 2ª ed. Little, Brown, 1981.
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