1. Berk, L. (2002). Infants, Children and adolescents. Boston, MA: Allyn & Bacon. 2. Berk, L., & Winsler, A.(1995). Scaffolding Children’s Learning: Vygotsky and early childhood education. Washington, DC: NAEYC. 3. Bruner, J (1960).The Process of Education, Cambridge, Mass.: Harvard University Press. 4. Herr,J.,Merritt,K.,Preusse,K.,Wurzer,R.(2004). Moozie’s Kindness Curriculum: Preschool. Breckenridge, CO: Children’s Kindness Network. 5. Honig,A., &Wittmer,D.(1996). Helping children become more pro-social: Ideas for classroom,families and communities. Young children, 51(2) 62-70. 6. Johnson, C., Ironsmith,M.,Snow,C., & Poteat, G. (2002). Peer acceptance and social adjustment in preschool and Kindergarten. Early Childhood Education Journal,27(4),207-212. 7. Kostelnik, M., Stein,L., Whiren,A., & Soderman, A.(1988). Guiding children’s social development. Cincinnati,OH: South-Western Publishing Co. 8. Marion,M.(2003). Guidance of young children. Columbus, OH:Merrill prentice Hall. 9. Sroufe,L.A., Cooper,R.G, & De Hart,G.(1992). Child Development(2nded)Mcgraw-Hill Inc.