Não informado. (1921). American Journal of Hygiene. John Hopkins University, School of Hygiene and Public Health.
Chicago-Zitierstil (17. Ausg.)Não informado. American Journal of Hygiene. Baltimore, Md: John Hopkins University, School of Hygiene and Public Health, 1921.
MLA-Zitierstil (8. Ausg.)Não informado. American Journal of Hygiene. John Hopkins University, School of Hygiene and Public Health, 1921.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.