1. Teenagers in the United States: sexual activity, contraceptive use, and childbearing, 2006-2010 National Survey of Family Growth;Martinez;Vital Health Stat 23,2011
2. Declines in unintended pregnancy in the United States, 2008-2011;Finer;N Engl J Med,2016
3. Continued declines in teen births in the United States, 2015;Hamilton;NCHS Data Brief,2016
4. United Nations. Demographic yearbook 2013. Sixty-four. New York; 2014. Available at: http://unstats.un.org/unsd/demographic/products/dyb/dyb2009-2010.htm. Accessed March 2, 2015.
5. A review of the risks and consequences of adolescent pregnancy;Jeha;J Neonatal Perinatal Med,2015