Simanjuntak, Donal H, Robert Tua Siregar, Marihot Manullang, and Sarintan E Damanik. “Potensi Ekonomi Kabupaten Dan Kota Di Provinsi Sumatera Utara”. Jurnal Regional Planning 3, no. 1 (February 19, 2021): 1–15. Accessed July 22, 2024. https://jurnal.usi.ac.id/index.php/regionalplanning/article/view/608.