1. An Introduction to Maternal Mortality;Nour;Reviews in Obstetrics and Gynecology,2008
2. World Health Organisation 2012 Maternal Mortality Fact Sheet No: 348 http://www.who.int/mediacentre/factsheets/fs348/en/index.html#
3. United Nations 2010 Millenium Development Goals Report 2010
4. WHO analysis of causes of maternal death: a systematic review;Khan;The Lancet,2006
5. World Health Organisation Maternal and Perinatel Health http://www.who.int/reproductivehealth/topics/maternal_perinatal/epidemiology/en/