Não informado. (1969). Environmental Health. Environmental Health Officers Association.
Citação do estilo Chicago (17ª ed.)Não informado. Environmental Health. London: Environmental Health Officers Association, 1969.
Citação MLA (8ª ed.)Não informado. Environmental Health. Environmental Health Officers Association, 1969.
אזהרה: ציטוטים אלה לעיתים לא מדויקים ב 100%.