1. Barnett EM. Pediatric occlusal therapy. 1st ed. Saint Louis: The CV Mosby Company; 1974.
2. Burdi AR, Moyers RE. Development of the dentition and the occlusion. In: Moyers RE, editor. Handbook of orthodontics. 4th ed. Chicago: Yearbook Medical Publishing. Inc.; 1988.
3. Coon CS. The origin of races. 2nd ed. New York: Alfred A. Knopf; 1967.
4. Error and discrepancies in measurement of tooth size;Hunter;J. Dent. Res.,1960
5. The analysis of errors in orthodontic measurements;Houston;Am. J. Orthod.,1983