Prianto, Cahyo, Rd Nuraini, and Andi Tenri Wali. “Implementation of K-Means Methods In Clustering Students Ability Levels in English Language”. The IJICS (International Journal of Informatics and Computer Science) 3, no. 2 (October 2, 2019): 49–58. Accessed October 28, 2025. https://ejurnal.stmik-budidarma.ac.id/index.php/ijics/article/view/1382.