Não informado. (1921). Sanitation supplements of the tropical diseases bulletin. Bureau of Hygiene and Tropical Diseases.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Sanitation Supplements of the Tropical Diseases Bulletin. London: Bureau of Hygiene and Tropical Diseases, 1921.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Sanitation Supplements of the Tropical Diseases Bulletin. Bureau of Hygiene and Tropical Diseases, 1921.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.