1. Standard Dental Dictionary;Ottofy,1923
2. Glossary of Orthodontic Terms;Daskalogiannakis,2000
3. Handbook of Orthodontics for the Student and General Practitioner;Moyers,1973
4. Biologic Basis of Orthodontics;Gianelly,1971
5. Biomechanics in Orthodontics;Marcotte,1990