Dryfoos, Joy G., and Carol Barkin. "Why Look at Teens in the 21st Century?." Adolescence: Growing Up in America Today. : Oxford University Press, 2006-08-31. Oxford Scholarship Online. 2012-03-22. Date Accessed 24 May. 2013 <http://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780195179613.001.0001/acprof-9780195179613-chapter-1>.
Dryfoos, J., & Barkin, C.(2006-08-31). Why Look at Teens in the 21st Century?. In Adolescence: Growing Up in America Today. : Oxford University Press. Retrieved 24 May. 2013, from http://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780195179613.001.0001/acprof-9780195179613-chapter-1.
Dryfoos, Joy G., and Carol Barkin. "Why Look at Teens in the 21st Century?." In Adolescence: Growing Up in America Today. : Oxford University Press, 2006-08-31. http://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780195179613.001.0001/acprof-9780195179613-chapter-1.
Dryfoos JG, Barkin C. Why Look at Teens in the 21st Century?. In: Dryfoos JG, Barkin C. Adolescence: Growing Up in America Today. Oxford University Press; 2006. http://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780195179613.001.0001/acprof-9780195179613-chapter-1. Accessed May 24, 2013.