Não informado. (1981). Abstracts on hygiene and communicable diseases. Bureau of Hygiene and Tropical Diseases.
Citação do estilo Chicago (17ª ed.)Não informado. Abstracts on Hygiene and Communicable Diseases. London: Bureau of Hygiene and Tropical Diseases, 1981.
Citação MLA (8ª ed.)Não informado. Abstracts on Hygiene and Communicable Diseases. Bureau of Hygiene and Tropical Diseases, 1981.
אזהרה: ציטוטים אלה לעיתים לא מדויקים ב 100%.