Azman, Muhammad Aizat Shahmin, and Aizan Ubin. “Tennis Collector Ball Machine”. Evolution in Electrical and Electronic Engineering 4, no. 2 (October 26, 2023): 725–731. Accessed July 1, 2024. https://penerbit.uthm.edu.my/periodicals/index.php/eeee/article/view/13301.