Não informado. (1981). Abstracts on hygiene and communicable diseases. Bureau of Hygiene and Tropical Diseases.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Abstracts on Hygiene and Communicable Diseases. London: Bureau of Hygiene and Tropical Diseases, 1981.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Abstracts on Hygiene and Communicable Diseases. Bureau of Hygiene and Tropical Diseases, 1981.
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