Não informado. (1921). American Journal of Hygiene. John Hopkins University, School of Hygiene and Public Health.
Cita Chicago Style (17a ed.)Não informado. American Journal of Hygiene. Baltimore, Md: John Hopkins University, School of Hygiene and Public Health, 1921.
Cita MLA (8a ed.)Não informado. American Journal of Hygiene. John Hopkins University, School of Hygiene and Public Health, 1921.
Precaución: Estas citas no son 100% exactas.