“Perancangan Sistem Informasi Gereja GKPI Sei Agul Medan Berbasis Web Dengan Object Oriented Technology”, JUSTIN, vol. 1, no. 1, pp. 13–20, Apr. 2024, Accessed: Sep. 09, 2026. [Online]. Available: https://justin.transmultimed.id/index.php/info/article/view/4