Não informado. (1998). American journal of hygiene. Johns Hopkins University, School of Hygiene and Public Health.
Citação do estilo Chicago (17ª ed.)Não informado. American Journal of Hygiene. Baltimore, Md: Johns Hopkins University, School of Hygiene and Public Health, 1998.
Citação MLA (8ª ed.)Não informado. American Journal of Hygiene. Johns Hopkins University, School of Hygiene and Public Health, 1998.
אזהרה: ציטוטים אלה לעיתים לא מדויקים ב 100%.