Tumpal Richardo Sirait. “Pengaruh Katekisasi Sidi Terhadap Perubahan Perilaku Remaja Kristen Di HKBP Kobun Kopi”. Bulletin of Community Engagement 4, no. 2 (August 21, 2024): 265–270. Accessed April 18, 2026. https://attractivejournal.com/index.php/bce/article/view/1401.