1. Callander CL: Surgical Anatomy. Philadelphia, W. B. Saunders, 1947, p 449
2. Courtney H: Anatomy of the pelvic diaphragm and anorectal musculature as related to sphincter preservation in anorectal surgery. Am J Surg 79: 155, 1950
3. Delbet P: Vessie, Uretre, Prostate, Verge, Perinee. Poirier and Charpy's Traite d'Anatomie Humaine. Second edition. Paris, 1907, volume 5, fasx 1
4. Gorsch RV: Proctologic Anatomy. Second edition. Baltimore, Williams and Wilkins, 1955, p 86
5. Hudson PB:In Urology. Third edition. Edited by ME Campbell, JH Harrison Philadelphia W. B. Saunders, 1970, volume 3, p 2470