1. 1. J. Warkany(1971 ) Congenital Malformations. Notes and comments , 1st edn , p.10 . Year Book Medical Publishers, Chicago.
2. 3. Sir A. Cooper(1804 ) The Anatomy & Surgical Treatment of Inguinal and Congenital Hernia , p.76 . T. Cox. London.
3. Congenital Diaphragmatic Hernia