1. Antenatal Care for Uncomplicated Pregnancies. National Institute for health care excellence (NICE) guideline CG62. Published March 2008. https://www.nice.org.uk/guidance/cg62 . Accessed 23 Feb 2017.
2. Postnatal care up to 8 weeks after birth. National Institute for health care excellence (NICE) guideline CG37. Published July 2006. https://www.nice.org.uk/guidance/cg37 . Accessed 21 Feb 2017.
3. Intrapartum care for healthy women and babies. National Institute for health care excellence (NICE) guideline CG190. Published Dec 2014. https://www.nice.org.uk/guidance/CG190 . Accessed 21 Feb 2017.
4. Knight M, Kenyon S, Brocklehurst P, Neilson J, Shakespeare J, Kurinczuk J. Saving lives, improving mothers’ care - lessons learned to inform future maternity care from the UK and Ireland Confiential enquiries into maternal deaths and morbidity 2009–12. Oxford: MBRRACE UK; 2014.
5. Cantwell R, Clutton-Brock T, Cooper G, Dawson A, Drife J, Garrod D, et al. Saving Mothers' lives: reviewing maternal deaths to make motherhood safer: 2006-2008. The eighth report of the confidential enquiries into maternal deaths in the United Kingdom. BJOG 2011; 118:Suppl. 1:1–203.