Sanmuga Raja, Jeviena Rani, and Azizul Azhar Ramli. “Iot-Integrated Built-In Doorbell and Monitoring System”. Applied Information Technology And Computer Science 6, no. 2 (December 3, 2025): 1644–1663. Accessed April 7, 2026. https://publisher.uthm.edu.my/periodicals/index.php/aitcs/article/view/20455.