1. The malocclusion of the teeth;Angle,1907
2. Personal letter from Glen Terwilliger to Jack Cross, June 30, 1977.
3. The Latest and Best in Orthodontic Mechanism;Angle;The Dental Cosmos,1928
4. The Latest and Best in Orthodontic Mechanism;Angle;The Dental Cosmos,1929
5. The Latest and Best in Orthodontic Mechanism;Angle;The Dental Cosmos,1929