1. Moir J. Chassar, Myerscough P. R. (1971). Munro Kerr's Operative Obstetrics, 8th edition, p. 596. London: Baillière, Tindall, and Cassell.
2. Donald I. (1969). Practical Obstetric Problems, 4th edition, p. 594. London: Lloyd Luke.
3. Symphysiotomy