1. Graphic records in labour;Philpott;Br Med J,1972
2. World health organization maternal health and safe motherhood programme;World health organization partograph in management of labour;Lancet,1994
3. Shoulder dystocia and birth injury: prevention and treatment;O'Leary,1992
4. An objective definition of shoulder dystocia: prolonged head-to-body delivery intervals and/or the use of ancillary obstetric maneuvers;Spong;Obstet Gynecol,1995
5. Confidential enquiry into stillbirths and deaths in infancy – 5th annual report: maternal and child health research consortium; 1998.