1. Essentials of Oral Surgery;Blair,1923
2. Dewey, M.: Practical Orthodontia (revised by George M. Anderson). 5th ed. St. Louis, Mosby Co., p. 242.
3. Year Book of Dentistry;Anderson,1936
4. Open bite;Hellman;Internat. J. Orthodont.,1931
5. Bone and Bones;Weinmann,1947