1. P. Fogh-Anderson, and J. J. Longarce (1968 )-"Craniofacial Anomalies: Pathogenesis and Repair ." , J. B. Lippincott Company, Philadelphia, p.163 .
2. B. Klein, and J. J. Longarce (1968 )-"Craniofacial Anomalies: Pathogenesis and Repair ." , J. B. Lippincott Company, Philadelphia, p.31 .