Não informado. (1998). American journal of hygiene. Johns Hopkins University, School of Hygiene and Public Health.
Lua i Stíl Chicago (17ú heag.)Não informado. American Journal of Hygiene. Baltimore, Md: Johns Hopkins University, School of Hygiene and Public Health, 1998.
Lua MLA (8ú heag.)Não informado. American Journal of Hygiene. Johns Hopkins University, School of Hygiene and Public Health, 1998.
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