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دليل المستخدم
Malak، M. A.، و Nichols، J. (1976). THE RELATIONSRIP BETWEEN CERTAIN PIAGETIAN TASKS AND ARITHMETIC ABILITY OF THE FIRST GRADE SAUDI MALE CHILDREN (رسالة دكتوراه غير منشورة). University of Northern Colorado، قريلي. مسترجع من http://search.mandumah.com/Record/614827
Malak، Mohammad Ali، و Joe Nichols. "THE RELATIONSRIP BETWEEN CERTAIN PIAGETIAN TASKS AND ARITHMETIC ABILITY OF THE FIRST GRADE SAUDI MALE CHILDREN" رسالة دكتوراه. University of Northern Colorado، قريلي، 1976. مسترجع من http://search.mandumah.com/Record/614827