Não informado. (1917). City health. Department of Health.
Chicago-referens (17:e uppl.)Não informado. City Health. Detroit, Mich: Department of Health, 1917.
MLA-referens (8:e uppl.)Não informado. City Health. Department of Health, 1917.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.