1. Johnson: Operative Dentistry, Fourth Edition.
2. Johnson, A. LeRoy: The Individual Normal Occlusion, University of Pennsylvania Lectures.
3. Angle, Edward H.: Malocclusion of the Teeth, Seventh Edition, S. S. White Co.
4. The Strategy of Orthodontic Treatment;Atkinson;Dental Cosmos,1937
5. Contacts and Contours;Hubert;J. A. D. A.,1940