1. Practical Orthodontics;Anderson,1955
2. Treatment of Malocclusion of the Teeth;Angle,1907
3. Indications for the Extraction of Teeth in Orthodontic Procedures;Tweed;Am. J. Orthodontics & Oral Surg.,1944
4. Limitations of Orthodontic Treatment;Nance;Am. J. Orthodontics & Oral Surg.,1947