1. National Institute for Health Clinical Excellence. Intrapartum care: care of healthy women and their babies during childbirth (CG190). London: National Institute for Health and Clinical Excellence. http://www.nice.org.uk/guidance/cg190 . Published 2014. Accessed 1 June 2015.
2. World Health Organization. Promoting Effective Perinatal Care. Essential Antenatal, Perinatal and Postpartum Care. http://www.euro.who.int/__data/assets/pdf_file/0013/131521/E79235.pdf . Published 2002. Accessed 1 June 2015.
3. Olayemi O, Aimakhu CO, Udoh ES. Attitudes of patients to obstetric analgesia at the University College Hospital, Ibadan, Nigeria. J Obstet Gynaecol. 2003;23(1):38–40.
4. Olayemi O, Aimakhu CO, Akinyemi OA. The influence of westernisation on pain perception in labour among parturients at the University College Hospital, Ibadan. J Obstet Gynaecol. 2006;26(4):329–31.
5. World Health Organization. Ethopia statistics. 2015. http://www.who.int/countries/eth/en/Published . Accessed 1 June 2015.