1. Campbell, M. F.: Personal communication, March 1, 1948.
2. Complete double urethra in a female;Dannreuther;J. A. M. A.,1923
3. Congenital obstructions of the female urethra;Stevens;J. A. M. A.,1936
4. The Principles and Practice of Urology;Hinman,1935
5. Doppelte urethra;Kubig;Zentralbl. Gynäk.,1926