1. Cardiovascular effects of oxytocin;Weis;Obstetrics and Gynecology,1975
2. British National Formulary 44th edn British Medical Association/British Pharmaceutical Society of Great Britain 2002
3. Commission for Health Improvement. http://www.chi.nhs.uk/
4. Reports on Confidential Enquiries into Maternal Deaths: an audit of previous recommendations;Hibbard;Health Trends,1994