1. and (1978) The Neutral Zone in Complete and Partial Dentures. Second ed. St. Louis: C.V. Mosby, pp. 17-19.
2. and (1988) A Textbook of Head and Neck Anatomy. London: Year Book Medical Publisher Inc., p. 157.
3. The buccinator mechanism
4. (1980) Sicher's Oral Anatomy. Seventh ed. St. Louis: C.V. Mosby Co., p. 164.
5. (1912) Die Muskeln des Stammes Jena: Van Gustav Fischer Verlag, p. 113.