D. Liuw, W. W. Kalengkongan, B. Pinontoan, dan E. Ketaren, “IMPLEMENTATION OF AN IOT-BASED CONGREGANT COUNTING SYSTEM USING INFRARED PROXIMITY SENSOR E18-D80NK AND WEB DASHBOARD: CASE STUDY: BETHANY CITYWALK CHURCH”, JTM, vol. 15, no. 1, Jun 2026.