Não informado. (1998). American journal of hygiene. Johns Hopkins University, School of Hygiene and Public Health.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. American Journal of Hygiene. Baltimore, Md: Johns Hopkins University, School of Hygiene and Public Health, 1998.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. American Journal of Hygiene. Johns Hopkins University, School of Hygiene and Public Health, 1998.
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