Rezkilaturahmi, R., Istiyono, E., Widihastuti, W., Istiqlal, M., Ndayizeye, O., Pelila, J. R. O., & Muthmainnah, M. (2026). A Classical Test Theory Analysis of an English Achievement Test. Indonesian Journal of Applied Science and Engineering, 5(1), 1–15. https://doi.org/10.59247/ijase.v5i1.181