Não informado. (1970). Smoking and health bulletin. U.S. National Clearinghouse for Smoking and Health.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Smoking and Health Bulletin. Arlington, Va: U.S. National Clearinghouse for Smoking and Health, 1970.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Smoking and Health Bulletin. U.S. National Clearinghouse for Smoking and Health, 1970.
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