Osman, N. A., A. Ramli, and N. Tamat. “Design and Development of Ultra Violet LED Machine”. Politeknik & Kolej Komuniti Journal of Engineering and Technology, vol. 3, no. 1, Nov. 2018, pp. 9-19, https://app.mypolycc.edu.my/journal/index.php/PMJET/article/view/516.