1. Eden and Lockyer, C. (1935).Gynæcology, Churchill.
2. Cunningham, D. L. (1937).Manual of Practical Anatomy. Maclachlan and Stewart.
3. Fletcher Shaw, W. (1934).J. Obst. and Gyn. B. E., 41, 853.
4. Treves and Rogers (1944).Surgical Applied Anatomy. Cassell.
5. FitzGibbon, G. (1924).Practical Midwifery. Churchill.