Não informado. (1968). Bulletin of the Michigan Dental Hygienists Association. Michigan Dental Hygienists Association.
Chicago-Zitierstil (17. Ausg.)Não informado. Bulletin of the Michigan Dental Hygienists Association. Lansing, Mich: Michigan Dental Hygienists Association, 1968.
MLA-Zitierstil (8. Ausg.)Não informado. Bulletin of the Michigan Dental Hygienists Association. Michigan Dental Hygienists Association, 1968.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.