Não informado. (1921). Sanitation supplements of the tropical diseases bulletin. Bureau of Hygiene and Tropical Diseases.
Chicago-viite (17. p.)Não informado. Sanitation Supplements of the Tropical Diseases Bulletin. London: Bureau of Hygiene and Tropical Diseases, 1921.
MLA-viite (8. p.)Não informado. Sanitation Supplements of the Tropical Diseases Bulletin. Bureau of Hygiene and Tropical Diseases, 1921.
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