2Beckett & Johnson. H. C. (1995)Human Development. In R. L.Edwards(E. d. ) Encyclopedia of social work ( 19^th. ed. Vol. 2).Washington, DC : NASIV. Press.
3Charles H. Zastrow & Karen K. kirst-Ashman. Understanding Human Behavior and Social Environment, Sixth Edition,THOMSON BROOKS/COLE (2004).
4Homan, M. S ( 1999). Promoting Community Change: Making it happen in the real world (2nd ed. ). Pacific,CA:Brooks/Cole.
5Bronfenbrenner,U(1979).The ecology of human development:Experiences by nature and design[M].Harvard University Press.