Wijaya Sipahutar, Fahrul Rozi Lubis. WEB-BASED CHURCH WORSHIP SERVICE INFORMATION SYSTEM USING THE SPIRAL MODEL: A CASE STUDY OF GKPI AIR BERSIH. JKBTI [Internet]. 2026 Jan. 19 [cited 2026 Mar. 14];5(1):49-56. Available from: https://ojs.ninetyjournal.com/index.php/JKBTI/article/view/394