Gunawan, and K. Hidayati. “IRT Method for Measuring The Quality of High School Mathematics Mid-Semester Assessment Questions in Magelang”. Hipotenusa: Journal of Mathematical Society, vol. 6, no. 2, Dec. 2024, pp. 252-65, https://ejournal.uinsalatiga.ac.id/index.php/hipotenusa/article/view/2036.