Gaya APA

Goldman, H, M., Cohen, D, W. (1980). Periodontal Therapy (6th Edition). St. Louis: The C.V. Mosby Company.

Gaya MLA

Goldman, Henry, M.., Cohen, D., Walter. "Periodontal Therapy". 6th Edition St. Louis: The C.V. Mosby Company, 1980. Text.