Omar, Mohd Zaharuddin, and Zamri Mahamod. “Items’ Difficulty in the Lower Secondary Bahasa Melayu System Diagnostic Test (LSBMSD) Instruments”. International Journal of Psychosocial Rehabilitation, vol. 24, no. 6, Aug. 2020, pp. 2345-52, https://doi.org/10.61841/0kxe2026.