1. Turnpenny P, Ellard S: Congenital abnormalities. Emery’s Elements of Medical Genetics. 2005, Elseviers-Churchill Livingstone, Edinburgh, 1-5. 12
2. Hudgins I, Cassidy SB: Congenital malformations among live births at Arvand Hospital Ahwaz, Iran. Pak J Med Sci. 2008, 24: 33-37.
3. Rajangam S, Devi R: Consagunity and chromosomal abnormality in mental retardation and or multiple congenital anomalies. J Anat Soc India. 2007, 56: 30-33.
4. Malla BK: One year overview study of congenital anatomical malformation at birth in Maternity Hospital, Thapathali, Kathmandu. Rathmandu Uni Med J. 2007, 5: 557-60.
5. Hudgins L, Cassidy SB: Congenital anomalies. Neonatal-Perinatal Medicine 8thed. Edited by: Martin RG, Fanroff AA, Waish MC. 2006, Mosby-Elsvier, Philadephia, 561-81.