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دليل المستخدم
Shalaby، A. S. (1975). Documentation Systems and their Importance to the Fields of Engineering Information. الثقافة العربية، ع3 ، 31 - 33. مسترجع من http://search.mandumah.com/Record/680333
Shalaby، Al Said. "Documentation Systems and Their Importance to the Fields of Engineering Information." الثقافة العربية ع3 (1975): 31 - 33. مسترجع من http://search.mandumah.com/Record/680333