1. Personal communication;Curtner,1995
2. The American Association of Orthodontists: a history;Asbell,1965
3. Orthodontics in the year 2000;Gottlieb;J Clin Orthod,2000
4. A short history of the Pacific Coast Society of Orthodontists;Wahl;PCSO Bull,2000
5. Orthodontics at 2000;Curtis,2000