Rezigalla, A., A. Eleragi, M. Elkhalifa, and A. Mohammed. “Comparison Between students’ Perception and Examination Validity, Reliability and Items Difficulty: A Cross-Sectional Study ”. Sudan Journal of Medical Sciences (SJMS), Vol. 15, no. 2, June 2020, pp. 114–123, doi:10.18502/sjms.v15i2.5503.