Não informado. (1970). Smoking and health bulletin. U.S. National Clearinghouse for Smoking and Health.
Cita Chicago Style (17a ed.)Não informado. Smoking and Health Bulletin. Arlington, Va: U.S. National Clearinghouse for Smoking and Health, 1970.
Cita MLA (8a ed.)Não informado. Smoking and Health Bulletin. U.S. National Clearinghouse for Smoking and Health, 1970.
Precaución: Estas citas no son 100% exactas.