Não informado. (1906). Public Health. Department of Health.
Chicago-referens (17:e uppl.)Não informado. Public Health. Lansing, Mich: Department of Health, 1906.
MLA-referens (8:e uppl.)Não informado. Public Health. Department of Health, 1906.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.