Al Sayyad، M. M. (1971). THE REPUBLIC OF THE SUDAN: A GEOGRAPHICAL APPROACH TO ITS PROBLEM AS A DEVELOPING COUNTRY. مجلة البحوث والدراسات العربية، ع2 ، 35 - 47. مسترجع من http://search.mandumah.com/Record/660132
Al Sayyad، M. M. "THE REPUBLIC OF THE SUDAN: A GEOGRAPHICAL APPROACH TO ITS PROBLEM AS A DEVELOPING COUNTRY." مجلة البحوث والدراسات العربية ع2 (1971): 35 - 47. مسترجع من http://search.mandumah.com/Record/660132