Erwinda, Lira, et al. “Evaluasi Karakteristik Butir Soal Tes Numerikal Differential Aptitude Test Melalui Analisis Psikometrik”. Journal of Mathematical Psychometrics and Measurement Science, vol. 1, no. 1, May 2026, pp. 10-25, https://journal.aapbk.org/index.php/jmpms/article/view/565.