Não informado. (1968). Bulletin of the Michigan Dental Hygienists Association. Michigan Dental Hygienists Association.
Chicago-referens (17:e uppl.)Não informado. Bulletin of the Michigan Dental Hygienists Association. Lansing, Mich: Michigan Dental Hygienists Association, 1968.
MLA-referens (8:e uppl.)Não informado. Bulletin of the Michigan Dental Hygienists Association. Michigan Dental Hygienists Association, 1968.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.