Não informado. (1971). Nation's Health. American Public Health Association.
Chicago-Zitierstil (17. Ausg.)Não informado. Nation's Health. New York: American Public Health Association, 1971.
MLA-Zitierstil (8. Ausg.)Não informado. Nation's Health. American Public Health Association, 1971.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.