Gaya APA

PERRY, D, A. et al (2007). Periodontology for the dental hygienist (4th edition). St.Louis: Elex Media Komputindo.

Gaya MLA

PERRY, Dorothy, A.. et al. "Periodontology for the dental hygienist". 4th edition St.Louis: Elex Media Komputindo, 2007. Text.