Nisa, Chairun, and Heri Retnawati. “Comparing the Methods of Vertical Equating for the Math Learning Achievement Tests for Junior High School Students”. REID (Research and Evaluation in Education) 4, no. 2 (December 22, 2018): 164–174. Accessed May 10, 2025. https://journal.uny.ac.id/index.php/reid/article/view/19291.