Explaining recent declines in adolescent pregnancy in the United States: the contribution of abstinence and improved contraceptive use. Santelli JS, Duberstein Lindberg L, Finer LB, Singh S. Am J Public Health 97:150–156, 2007.

Legal abortion worldwide: incidence and recent trends. Sedgh G, Henshaw SK, Singh S, Bankole A, Drescher J. International Family Planning Perspectives, 33(3):106–116, 2007.

U.S. teenage pregnancy statistics national and state trends and trends by race and ethnicity. Guttmacher Institute, updated September 2006

Disparities in rates of unintended pregnancy in the United States, 1994 and 2001. Finer LB, Henshaw SK. Perspectives on Sexual and Reproductive Health, 38(2):90–96, 2006.

Differences in teenage pregnancy rates among five developed countries: the roles of sexual activity and contraceptive use. Darroch JE, Singh S, Frost JJ & the Study Team. Family Planning Perspectives, 2001, 33(6):244-250 & 281, 2001

In addition:

Abstinence-only and comprehensive sex education and the initiation of sexual activity and teen pregnancy. Kohler PK, Manhart LE, Lafferty WE. J Adolesc Health 42(4):344-51, 2008.

Global perspectives on the sexual and reproductive health of adolescents: patterns, prevention, and potential. Bearinger LH, Sieving RE, Ferguson J, Sharma V. Lancet 369(9568):1220-31, 2007.

A public health success: understanding policy changes related to teen sexual activity and pregnancy. Brindis CD. Annu Rev Public Health 27:277-95, 2006.