Gaya APA

Nield-Gehrig, J, S., Willmann, D, E. (2011). Foundations of Periodontics for the Dental Hygienist (3). Philadelphia: Wolters Kluwer Health.

Gaya MLA

Nield-Gehrig, Jill, S.., Willmann, Donald, E.. "Foundations of Periodontics for the Dental Hygienist". 3 Philadelphia: Wolters Kluwer Health, 2011. Elektronik/Digital.