Sumartika Br Hutasoit, Budi Serasi Ginting and Fuzi Yustika Manik 2024. Grouping Library Book Collection Based On Old Book Borrowers With Clustering Method (Case study: STMIK Kaputama). International Journal of Health Engineering and Technology (IJHET). 3, 3 (Sep. 2024). DOI:https://doi.org/10.55227/ijhet.v1i2.36.