1. Centre for Disease Control and Prevention: Achievements in public health, 1900–1999: Family planning. MMWR Weekly. 1999, 48 (47): 1073-1080.
2. United Nations: Millennium Development Goals 2000. 2000, New York: 3UN Plaza, 10017.
3. UNFPA: Programme of Action of the report of International Conference on Population and Development Held in Cairo. 1994
4. Bongaarts J, Cleland J, Townsend JW, Bertrand JT, Gupta MD: Family Planning Programs for the 21st Century: Rationale and Design, Volume ix. 2012, New York: The Population Council, 2012, 94.
5. Abdel AA, Amira O: Factors affecting unmet need for family planning in Eastern Sudan. BMC Public Health. 2013, 13: 102-10.1186/1471-2458-13-102.