1. The Alan Guttmacher Institute, Sharing Responsibility: Women, Society and Abortion Worldwide, New York: The Alan Guttmacher Institute, 1999.
2. Finer LB and Henshaw SK, Disparities in rates of unintended pregnancy in the United States, 1994 and 2001, Perspectives on Sexual and Reproductive Health, 2006, 38(2):90–96.
3. Glasier A., Safety of emergency contraception, Journal of the American Medical Women’s Association, 1998, 53(5 Suppl. 2):219–221.
4. Trussell J et al., Emergency contraceptive pills: a simple proposal to reduce unintended pregnancies, Family Planning Perspectives, 1992, 24(6):269–273.
5. Polis CB et al., Advance provision of emergency contraception for pregnancy prevention (full review), Cochrane Database of Systematic Reviews, 2007, Issue 2, No. CD005497.
6. Raymond EG, Trussell J and Polis CB, Population effect of increased access to emergency contraceptive pills: a systematic review, Obstetrics & Gynecology, 2007, 109(1):181–188.
7. Jones RK, Darroch JE and Henshaw SK, Contraceptive use among U.S. women having abortions in 2000–2001, Perspectives on Sexual and Reproductive Health, 2002, 34(6):294–303.
8. American College of Obstetricians and Gynecologists (ACOG), ACOG practice bulletin, emergency oral contraception, Number 25, March 2001, International Journal of Gynaecology and Obstetrics, 2002, 78(2):191–198.
9. Gold M et al., Provision of emergency contraception to adolescents: position paper of the Society for Adolescent Medicine, Journal of Adolescent Health, 2004, 35(1):66–70.
10. American Academy of Pediatrics Committee on Adolescence, American Academy of Pediatrics policy statement on emergency contraception, Pediatrics, 2005, 116(4):1026–1035.
11. International Planned Parenthood Federation, IMAP statement on emergency contraception, IPPF Medical Bulletin, 2004, 38(1):1–3.
12. Fagan EB et al., Knowledge, attitudes, and use of emergency contraception among rural western North Carolina women, Southern Medical Journal, 2006, 99(8):806–810.
13. Corbett PO et al., Emergency contraception: knowledge and perceptions in a university population, Journal of the American Academy of Nurse Practitioners, 2006, 18(4):161–168.
14. Cunnane MS, Dickson G and Cook RL, Women’s experiences with emergency contraception in an internal medicine practice, Journal of Women’s Health, 2006, 15(9):1080–1089.
15. Chuang CH and Freund KM, Emergency contraception knowledge among women in a Boston community, Contraception, 2005, 71(2):157–160.
16. Delbanco SF, Mauldon J and Smith MD, Little knowledge and limited practice: emergency contraceptive pills, the public, and the obstetrician-gynecologist, Obstetrics & Gynecology, 1997, 89(6):1006–1011.
17. Ellertson C et al., Emergency contraception: a review of the programmatic and social science literature, Contraception, 2000, 61(3):145–186.
18. Society for Family Health, Emergency Contraception in Nigeria, Lagos, Nigeria: Society for Family Health, 1998.
19. Kosusen E, Sihvo S and Hemminki E, Knowledge and use of hormonal emergency contraception in Finland, Contraception, 1997, 55(3):153–157.
20. Crosier A., Women’s knowledge and awareness of emergency contraception, British Journal of Family Planning, 1996, 22(2):87–90.
21. Black KI et al., Sociodemographic and sexual health profile of users of emergency hormonal contraception: data from a British probability sample survey, Contraception, 2006, 74(4):309–312.
22. Goulard H et al., Contraceptive failures and determinants of emergency contraception use, Contraception, 2006, 74(3):208–213.
23. Chandra A et al., Fertility, family planning, and reproductive health of U.S. women: data from the 2002 National Survey of Family Growth, Vital and Health Statistics, 2005, Series 23, No. 25.
24. Abma JC et al., Teenagers in the United States: sexual activity, contraceptive use, and childbearing, 2002, Vital and Health Statistics, 2004, Series 23, No. 24.
25. Mosher WD et al., Use of contraception and use of family planning services in the United States: 1982–2002, Advance Data from Vital and Health Statistics, 2004, No. 350.
26. Groves RM et al., Plan and operation of Cycle 6 of the National Survey of Family Growth, Vital and Health Statistics, 2005, Series 1, No. 42.
27. Lepkowski JM et al., National Survey of Family Growth, Cycle 6: sample design, weighting, imputation, and variance estimation, Vital and Health Statistics, 2006, Series 2, No. 142.
28. U.S. Department of Health and Human Services, Public use data file documentation, National Survey of Family Growth Cycle 6: 2002, user’s guide, 2004, accessed Mar. 8, 2007.
29. Hamilton BE. and Ventura SJ, Fertility and abortion rates in the United States, 1960–2002, International Journal of Andrology, 2006, 29(1):34–45.
30. Schwarz EB et al., Knowledge of and perceived access to emergency contraception at two urgent care clinics in California, Contraception, 2007, 75(3):209–213.
31. Yarnall KS et al., Primary care: is there enough time for prevention? American Journal of Public Health, 2003, 93(4):635–641.
32. Fiore MB et al., Treating Tobacco Use and Dependence: Clinical Practice Guideline, Rockville, MD: U.S. Department of Health and Human Services, 2000.
33. Glasier A and Baird D, The effects of self-administering emergency contraception, New England Journal of Medicine, 1998, 339(1):1–4.
34. Jackson RA et al., Advance supply of emergency contraception: effect on use and usual contraception—a randomized trial, Obstetrics & Gynecology, 2003, 102(1):8–16.
35. Raine T et al., Emergency contraception: advance provision in a young, high-risk clinic population, Obstetrics & Gynecology, 2000, 96(1):1–7.
36. Raine TR et al., Direct access to emergency contraception through pharmacies and effect on unintended pregnancy and STIs: a randomized controlled trial, Journal of the American Medical Association, 2005, 293(1):54–62.
37. Fu H et al., Measuring the extent of abortion underreporting in the 1995 National Survey of Family Growth, Family Planning Perspectives, 1998, 30(3):128–133 & 138.