Wijaya, Junjun, and Monika Stevany Manurung. “Penggerombolan Kabupaten/Kota Di Sumatera Utara Berdasarkan Produktivitas Tanaman Pangan”. Journal of Analytical Research, Statistics and Computation 2, no. 2 (September 12, 2023). Accessed April 18, 2026. https://www.jarsic.org/main/article/view/23.