1. Teenagers in the United States: sexual activity, contraceptive use, and childbearing 2002;Abma;Vital Health Stat,2004
2. America's families and living arrangements: 2003;Fields,2004
3. Trends in premarital sex in the United States, 1954–2003;Finer;Public Health Rep,2007
4. Youth risk behavior surveillance–United States, 2005;Eaton;MMWR Surveill Summ,2006
5. Disparities in rates of unintended pregnancy in the United States, 1994 and 2001;Finer;Perspect Sex Reprod Health,2006