1. World Health Organization. Primary health care: 25 years after ALMA-ATA. 2003.
2. Rates of caesarean section: analysis of global, regional and national estimates;AP Betrán;Paediatr Perinat Epidemiol,2007
3. The global numbers and costs of additionally needed and unnecessary caesarean sections performed per year: overuse as a barrier to universal coverage;L Gibbons;World health report,2010
4. Global patterns in availability of emergency obstetric care;A Paxton;International Journal of Gynecology & Obstetrics,2006
5. Availability and distribution of, and geographic access to emergency obstetric care in Zambia;S Gabrysch;International Journal of Gynecology & Obstetrics,2011