1. Contemporary Orthodontics;Profitt,2000
2. National Health and Nutrition Estimates Survey (NHANES III).
3. On an Equilibrium Theory of Tooth Position;Weinstein;Angle Orthod,1994
4. The Dentition of the Growing Child;Moorrees,1959
5. Standards of Human Occlusal Development. Monograph 5. Craniofacial Growth Series. Ann Arbor Center for Human Growth and Development;Moyers;The University of Michigan,1976