1. M. Barratrser, and R. Winter(1983 ) A Colour Atlas of Clinical Genetics , p.368 . Wolfe Medical Publications Ltd., London.
2. Apparent hypodontia
3. D.J. Forrester, M.L. Wagner, and J. Fleming(1981 ) Pediatrie Dental Medicine , p. 68 , Lea & Febiger, Philadelphia.
4. R.J. Gorlin, J.J. Pindrorg, and M.M. Cohen(1976 ) Syndromcs of the Head and Neek , 2nd edn. p.546 . McGraw Hill, New York.