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دليل المستخدم
Moustafa، A. E. (1987). Using Manipulatives In Teaching Numeration Systems To Third Year Students Mathematics Section Faculty Of Education Minia Egypt. مجلة كلية التربية، ع3 ، 440 - 459. مسترجع من http://search.mandumah.com/Record/680496
Moustafa، Ahmed E. "Using Manipulatives In Teaching Numeration Systems To Third Year Students Mathematics Section Faculty Of Education Minia Egypt." مجلة كلية التربية ع3 (1987): 440 - 459. مسترجع من http://search.mandumah.com/Record/680496