Não informado. (1921). American Journal of Hygiene. John Hopkins University, School of Hygiene and Public Health.
Chicagoスタイル(17版)引用形式Não informado. American Journal of Hygiene. Baltimore, Md: John Hopkins University, School of Hygiene and Public Health, 1921.
MLA(8版)引用形式Não informado. American Journal of Hygiene. John Hopkins University, School of Hygiene and Public Health, 1921.
警告: この引用は必ずしも正確ではありません.