1. 4-H History 2013 http://www.4-h.org/about/4-h-history/
2. Afterschool Alliance 2013 21st Century Community Learning Center Initiative http://www.afterschoolalliance.org/policy21stcclc.cfm
3. Home alone: Supervision after school and child behavior;Aizer;Journal of Public Economics,2004
4. Parental support and pressure and children's extracurricular activities: Relationships with amount of involvement and affective experience of participation;Anderson;Journal of Applied Developmental Psychology,2003
5. Auger , A. Pierce , K. M. Vandell , D. L. 2013 Associations between structured activity participation and academic outcomes in middle childhood: Narrowing the achievement gap?