Ismail, Raoda, Heri Retnawati, and Okky Riswandha Imawan. “Cluster Analysis of the National Examination: School Grouping to Maintain the Sustainability of High School Quality”. REID (Research and Evaluation in Education) 8, no. 1 (June 30, 2022): 13–23. Accessed May 10, 2025. https://journal.uny.ac.id/index.php/reid/article/view/45872.