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8Wittroch,M.C.(ed.) (1986).Handbook of Research on Teaching (Third Edition).New York:Macmillan.
9National Commission on Service-Learning.(2002).Learning in Deed:The Power of Service-Learning for American Schools.P.42.
10Melchior,A.(1997).National Evaluation of Learn and Serve America School and Community-based Programs.Waltham,MA:Center for Human Resources,Brandeis University.Billig,S.(2000).Research on K-12 School-Based Service-Learning:The Evidence Builds.Phi Delta Kappan,81(9):658-664.
