Não informado. (1971). American Journal of Public Health. American Public Health Association.
Chicago-referens (17:e uppl.)Não informado. American Journal of Public Health. Washington: American Public Health Association, 1971.
MLA-referens (8:e uppl.)Não informado. American Journal of Public Health. American Public Health Association, 1971.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.