hassan, y. f. (1971). sudan in africa: Studies presented to the first international conference sponsored by the sudan research unit. khartoum: khartoum university press.
استشهاد بنمط شيكاغوhassan, yusuf fadl. Sudan in Africa: Studies Presented to the First International Conference Sponsored By the Sudan Research Unit. khartoum: khartoum university press, 1971.
MLA استشهادhassan, yusuf fadl. Sudan in Africa: Studies Presented to the First International Conference Sponsored By the Sudan Research Unit. khartoum: khartoum university press, 1971.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.