Não informado. (1998). American journal of hygiene. Johns Hopkins University, School of Hygiene and Public Health.
Chicago-referens (17:e uppl.)Não informado. American Journal of Hygiene. Baltimore, Md: Johns Hopkins University, School of Hygiene and Public Health, 1998.
MLA-referens (8:e uppl.)Não informado. American Journal of Hygiene. Johns Hopkins University, School of Hygiene and Public Health, 1998.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.