Sumartika Br Hutasoit, Budi Serasi Ginting, and Fuzi Yustika Manik. “Grouping Library Book Collection Based On Old Book Borrowers With Clustering Method (Case Study: STMIK Kaputama)”. International Journal of Health Engineering and Technology (IJHET), vol. 3, no. 3, Sept. 2024, doi:10.55227/ijhet.v1i2.36.