1. Malocclusion of the teeth;Angle,1907
2. National Health Service orthodontics in general practice;Cousins;Trans. Eur. Orthod. Soc.,1973
3. Background and development of the orthodontic services in the National Health Service;Dickson;Trans. Eur. Orthod. Soc.,1973
4. Natural history of human teeth;Fox,1803
5. Natural history of human teeth;Hunter,1771