1. Batsakis, J. G.:Tumors of the head and neck: clinical and pathological consideration. 2nd ed., pp 543–546, The Williams & Wilkins Co., Baltimore, 1979.
2. Bernier, T. W.:The management of oral disease. 1st ed., p 558, The C. V. Mosby Co., St. Louis, 1955.
3. Brophy, T. M.:Oral surgery; a treatise on the disease, injuries, and malformations of the mouth and associated parts. Blaskistons & Sons Co., Philadelphia, 1915.
4. Goaz, P. W. and White, S. C.:Oral Radiology. 1st ed., pp 495–496, The C. V. Mosby Co., St. Louise, 1982.
5. Gorlin, R. J. and Goldman, H. M.:Thoma's oral pathology. 6th ed., Vol. 1, pp 503–506, The C. V. Mosby Co., St. Louise, 1970.