Mursal, Mona Elneel Mostafa, and Hanan Osman Amasaib Mohammed. “The Effect of Banking Services In Achieving Copetetive Advantage – A Case Study: Omdurman National Bank, 2017- 2021 –”. Journal of Economic, Administrative and Legal Sciences 6, no. 14 (May 31, 2022): 22–44. Accessed December 20, 2025. https://www.ajsrp.ojsexpert.com/index.php/jeals/article/view/5161.