1. Angle, E.H., Treatment of Malocclusion of the Teeth. 6th Ed. (Philadelphia, S. S· White : 1900). P. 14.
2. Root resorptions and their relation to pathologic bone formation
3. Brash, J.C., The Growth of the Jaws, Normal and Abnormal, In Health and in Disease, (London Dental Board of United Kingdom), 64.