Wijaya Sipahutar, and Fahrul Rozi Lubis. “WEB-BASED CHURCH WORSHIP SERVICE INFORMATION SYSTEM USING THE SPIRAL MODEL: A CASE STUDY OF GKPI AIR BERSIH”. Jurnal Kecerdasan Buatan dan Teknologi Informasi 5, no. 1 (January 19, 2026): 49–56. Accessed January 23, 2026. http://ojs.ninetyjournal.com/index.php/JKBTI/article/view/394.