Khair Elseed, Abdelsalam Awad. “‎ Sudan’s Accession to the World Trade Organization and Its Impact on the Proceeds of Tax and Customs Revenues (Field Study)”. Journal of Economic, Administrative and Legal Sciences 4, no. 2 (May 19, 2020): 44–25. Accessed December 20, 2025. https://ajsrp.ojsexpert.com/index.php/jeals/article/view/2162.