Não informado. (1998). American journal of hygiene. Johns Hopkins University, School of Hygiene and Public Health.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. American Journal of Hygiene. Baltimore, Md: Johns Hopkins University, School of Hygiene and Public Health, 1998.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. American Journal of Hygiene. Johns Hopkins University, School of Hygiene and Public Health, 1998.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.