Balqis Indriyana, and Riri Syafitri Lubis. “K-Medoids Clustering of Regencies and Cities in North Sumatra Province Based on Food Security Indicators With C-Index Validation and ArcGIS Mapping”. Journal of Computers and Digital Business, vol. 6, no. 1, Nov. 2026, pp. 21-28, doi:10.56427/jcbd.v6i1.1118.