“Design of a Web-Based Church Notice Board System Using the Waterfall Method”. Journal of Innovation and Technology Polbeng Series on Informatics (INOVTEK Polbeng - Seri Informatika) 10, no. 3 (November 15, 2025): 1542–1552. Accessed July 8, 2026. http://210.79.191.38/index.php/ISI/article/view/1197.