1. Histology of Oral Pigmentation
2. Pigmentation of the Oral Tissues: A Review of the Literature
3. 3. SN. Bhaskar, Synopsis of oral pathology . St. Louis: CV Mosby, 1981 : 430 .
4. 4. I. Glickman, Clinical periodontology . Philadelphia: W. B. Saunders, 1966 : 67 .
5. 5. R.I Gorlin, and HM. Goldman, Thoma's oral pathology . St. Louis: CV Mosby, 1970 : 876 .