1. Operative Obstetrics;Douglas,1976
2. Gray's Anatomy;Gray,1973
3. A new method of operation for the relief of the perineum through the sphincter and rectum;Warren;Trans. Amer. Gynecol. Soc,1882
4. Surgical management of recto-vaginal fistulas and complete perineal tears;Hibbard;Am. J. Obstet. Gynecol,1978
5. Pre-operative cortisone for vaginal fistulas;Collins;Obstet. Gynecol,1957