1. Langman's Medical Embryology,2004
2. The Developing Human; Clinically Oriented Embryology;Moore,1998
3. Normal and Anomalous Development of the Urogenital System;Park,2002
4. Transvaginal assessment of fetal urinary tract in early pregnancy;Rosati;Ultrasound Obstet Gynecol,1996
5. Circadian reflux in bladder volume in the term human fetus;Chamberlain;Obstet Gynecol,1984