Não informado. (1960). Bulletin of the Illinois Dental Hygienists Association. Illinois Dental Hygienists Association.
Chicago-referens (17:e uppl.)Não informado. Bulletin of the Illinois Dental Hygienists Association. Chicago, Ill: Illinois Dental Hygienists Association, 1960.
MLA-referens (8:e uppl.)Não informado. Bulletin of the Illinois Dental Hygienists Association. Illinois Dental Hygienists Association, 1960.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.