Não informado. (1921). Sanitation supplements of the tropical diseases bulletin. Bureau of Hygiene and Tropical Diseases.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Sanitation Supplements of the Tropical Diseases Bulletin. London: Bureau of Hygiene and Tropical Diseases, 1921.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Sanitation Supplements of the Tropical Diseases Bulletin. Bureau of Hygiene and Tropical Diseases, 1921.
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