Não informado. (1970). Smoking and health bulletin. U.S. National Clearinghouse for Smoking and Health.
Chicago-Zitierstil (17. Ausg.)Não informado. Smoking and Health Bulletin. Arlington, Va: U.S. National Clearinghouse for Smoking and Health, 1970.
MLA-Zitierstil (8. Ausg.)Não informado. Smoking and Health Bulletin. U.S. National Clearinghouse for Smoking and Health, 1970.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.