1. Chang LS: Vitelline duct remnant appearing as a hemorrhagic umbilical mass. JAMA. 1982, 247: 2812-3. 10.1001/jama.247.20.2812.
2. Ladd WF, Gross RE: Abdominal surgery of infancy and childhood. 1941, Philadelphia, W B Saunders and Co, 72.
3. James Lister, Irene Irving: 'Neonatal Surgery' Umbilical anomalies. 1990, Butterworth & Co, Chapter 27: 397-Third
4. Gvalani AK, Acharya GV, Rao RV, Dawookkar VV: Ileal prolapse through a patent vitellointestinal. Indian Practitioner. 1985, 38 (7): 629-32.