Não informado. Public Health Service Publications. U.S. Department of Health Education and Welfare.
Chicago-Zitierstil (17. Ausg.)Não informado. Public Health Service Publications. Washington: U.S. Department of Health Education and Welfare.
MLA-Zitierstil (8. Ausg.)Não informado. Public Health Service Publications. U.S. Department of Health Education and Welfare.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.