Sanmuga Raja, Jeviena Rani, and Azizul Azhar Ramli. “Iot-Integrated Built-In Doorbell and Monitoring System”. Applied Information Technology And Computer Science, vol. 6, no. 2, Dec. 2025, pp. 1644-63, https://publisher.uthm.edu.my/periodicals/index.php/aitcs/article/view/20455.