1. Andrews, E. W.: Cited from Barney, J. D.
2. Epithelioma of the penis: An analysis of 100 cases;Barney;Ann. Surg.,1907
3. The function of the vertebral veins and their role in the spread of metastases;Batson;Ann. Surg. 112: 138, 1940,1940
4. Billroth: Cited from Hinman F., Principles and Practice of Urology. Philadelphia.
5. Cabot, H.: Modern Urology, Philadelphia: Lea and Febiger, vol. I, 3rd ed., p. 170.