Wirjosudirdjo, S. (2019) “Perluasan Mengenai Koefisien Realibilitas dari Kuder-Richardson (KR-20)”, Journal of Mathematical and Fundamental Sciences, 8(2), pp. 53-66. Available at: https://journals.itb.ac.id/index.php/jmfs/article/view/9684 (Accessed: 5October2025).