Clark, D. W. (1981). Preventive and community medicine (2ª ed.). Little, Brown.
Tohutoru Kātū ChicagoClark, Duncan W. Preventive and Community Medicine. 2ª ed. Little, Brown, 1981.
Tohutoro MLAClark, Duncan W. Preventive and Community Medicine. 2ª ed. Little, Brown, 1981.
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