Simanihuruk RM. Geographical Information System for the Layout of the Simalungun Protestant Christian Church (GKPS) in Medan City. Mekintek [Internet]. 2023 Apr. 30 [cited 2026 Sep. 4];14(1):1-7. Available from: https://ejournal.isha.or.id/index.php/Mekintek/article/view/203