Yohana Susanthi, Herawati YS, Judea Janoto Jarden, and Ken Fernando Tentunata, “Recharging Prepaid Energy Meter via Internet Using ESP32-CAM and Telegram Messenger”, Jurnal Nasional Teknik Elektro dan Teknologi Informasi, vol. 15, no. 3, pp. 194-201, Jul. 2026.