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دليل المستخدم
Al Jasem، A. A. S.، و Carmack، W. R. (1982). AN ANALYTICAL AND DESCRIPTIVE COMPARISON OF INTERNATIONAL COMMUNICATION SYSTEMS IN THE UNITED STATES AND THE SOVIET UNION AS ADAPTED FOR USE IN SAUDI ARABIA (رسالة دكتوراه غير منشورة). Oklahoma University، نورمان. مسترجع من http://search.mandumah.com/Record/617680
Al Jasem، Abd Allah Saleh، و William R. Carmack. "AN ANALYTICAL AND DESCRIPTIVE COMPARISON OF INTERNATIONAL COMMUNICATION SYSTEMS IN THE UNITED STATES AND THE SOVIET UNION AS ADAPTED FOR USE IN SAUDI ARABIA" رسالة دكتوراه. Oklahoma University، نورمان، 1982. مسترجع من http://search.mandumah.com/Record/617680