1. Syndromes of the Head and Neck;Gorlin,1976
2. Classification of craniofacial syndromes;Gorlin,1979
3. A proposed new classification of craniofacial anomalies;Whitaker;Cleft Palate J,1981
4. Craniofacial Embryology;Sperber,1989
5. Embryology of the head and neck;Johnston,1990