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ثالثاً المراجع الانجليزية:
(1)M. D. Conover, J. Ratkiewicz, M. Francisco, B. Gonc,alves, A. Flaming, F. Mincer Center for Complex Networks and Systems Research School of informatics and Computing, Indiana university,Bloomington,U.S.A.2010. (2)Johnson, B. and Larry C. (2013) Educational Research: Quantitative, Qualitative, and Mixed Approaches, (5th ed.), USA