Barber, B. L., Eccles, J. S., & Stone, M. R. (2001). Whatever happened to the jock, the brain, and the princess? Young adult pathways linked to adolescent activity involvement and social identity. Journal of Adolescent Research, 16, 429–455.
Bartko, T. W., & Eccles, J. S. (2003). Adolescent participation in structured and unstructured activities: A person-oriented analysis.Journal of Youth and Adolescence, 32, 233–241.