Ikhbal Khan, Aasraffiqh, and FATIMAH BINTI MOHAMMED YUSOP. “Development of Voice Recognition Door Lock With Keypad”. Progress in Engineering Application and Technology 4, no. 1 (May 25, 2023): 859–869. Accessed July 18, 2024. https://penerbit.uthm.edu.my/periodicals/index.php/peat/article/view/10439.