MosherWDJonesJ. Use of contraception in the United States: 1982–2008. Vital Health Stat Series 232010 (29).
2.
AbmaJCMartinezGMCopenCE. Teenagers in the United States: Sexual activity, contraceptive use, and childbearing, National Survey of Family Growth 2006–2008. Vital Health Stat Series 232010 (30).
3.
LepkowskiJMMosherWDDavisKEGrovesRMVan HoewykJ. The 2006–2010 National Survey of Family Growth: Sample design and analysis of a continuous survey. Vital Health Stat Series 22010 (150).