1. Preker AS, Scheffler RM, Bassett MC (2007) Private voluntary health insurance in development: friend or foe. The World Bank, Washington, DC. Retrieved Feb, 2016, from https://openknowledge.worldbank.org/bitstream/handle/10986/6641/382810Private0101OFFICIAL0USE0ONLY1.pdf?sequence=1&isAllowed=y
2. Bloom G (1988) Financing health-services in developing-countries—an agenda for reform. J Dev Stud 24(3):448–449
3. WHO (1995) Interregional consultation on health insurance reform, Seoul, Republic of Korea, April 3–7. WHO, Geneva. Retrieved Feb 3, 2016, from http://apps.who.int/iris/bitstream/10665/59586/1/WHO_SHS_NHP_95.9.pdf
4. Preker AS, Liu X, Velenyi EV, Baris E (2007) Public ends, private means: strategic purchasing of health services. The World Bank, Washington, DC. Retrieved Feb 3, 2016, from file:///C:/Users/ayman/Downloads/779090PUB0EPI00LIC00pubdate05020013.pdf
5. WHO. Health systems financing: the path to universal coverage. World health report 2010. Retrieved 20 June, 2016, from http://www.who.int/whr/2010/10_summary_en.pdf?ua=1