1Dworkin,J. B. , I,arson,R. ,& Hansen, D. Adolescents' accounts of growth experiences in youth activities[ J]. Journal of Youth and Adoles- cence, 2003, ( 32 ).
2Eccles,J. ,& Templeton,J. ExtracmTicular and other after -school ac- tivities for youth[ J]. Review of Education,2002, (26).
3Dubas,J. S. , & Snider, B. A. The rele of community - based youth groups in enhancing learning and achievement through nonformal educa- tion[ M]. Early adolescence: Perspectives on research, policy,and in- tervention. Hillsdale, NJ:Erlbaum, 1993.