Mursal, Mona Elneel Mostafa, and Hanan Osman Amasaib Mohammed. 2022. β€œThe Effect of Banking Services In Achieving Copetetive Advantage – A Case Study: Omdurman National Bank, 2017- 2021 –”. Journal of Economic, Administrative and Legal Sciences 6 (14): 22-44. https://doi.org/10.26389/AJSRP.L120222.