Não informado. (1981). International Journal of Periodontics and Restorative Dentistry. Quintessence Publishing.
Chicago-Zitierstil (17. Ausg.)Não informado. International Journal of Periodontics and Restorative Dentistry. Chicago, Ill: Quintessence Publishing, 1981.
MLA-Zitierstil (8. Ausg.)Não informado. International Journal of Periodontics and Restorative Dentistry. Quintessence Publishing, 1981.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.