1. Contraception: Past, Present and Future and Why It Matters. Sexual and Reproductive Health Program
http://who.int/reproductivehealth/topics/family_planning/en/
2. Contraceptive decision-making: Background and outcomes of contraceptive methods. Rutgers World Population Foundation (WPF)
https://www.rutgers.nl/sites/rutgersnl/files/PDF/Contraceptive_Decisions_Report-def.pdf
3. Trends in Contraceptive Use Worldwide 2015
http://www.un.org/en/development/desa/population/publications/pdf/family/trendsContraceptiveUse2015Report.pdf
4. The Global Program to Enhance Reproductive Health Commodity Security: Annual Report 2013
http://www.unfpa.org/publications/global-programme-enhance-reproductive-health-commodity-security-annual-report-2013
5. Family planning and contraceptive decision-making by economically disadvantaged, African–American women