Putri, Nofet, Abulawafa Muhammad, and Raja Ayu Mahessya. “Grouping Building Material Sales for Management Optimization With the K-Means Algorithm”. Journal of Computer Scine and Information Technology 9, no. 3 (July 31, 2023): 119–124. Accessed April 29, 2026. https://jcsitech-upiyptk.org/ojs/index.php/jcsitech/article/view/74.