Ahmed، G. K. (1998). The Relations Between Sudan and China: From The Pre-Islamic Era until the 19th century with special focus on The relations During Tang and Song llgnasties In China. دراسات إفريقية، ع18 ، 5 - 20. مسترجع من http://search.mandumah.com/Record/790149
Ahmed، Gaafar K. "The Relations Between Sudan and China: From The Pre-Islamic Era Until the 19th Century With Special Focus On The Relations During Tang and Song Llgnasties In China." دراسات إفريقية ع18 (1998): 5 - 20. مسترجع من http://search.mandumah.com/Record/790149