Yusjah, M. N. N. ., Abd Kahar, H. . and Amat Rithuan, M. Z. . (2021) “Smart Step Ladder”, Multidisciplinary Applied Research and Innovation, 2(3), pp. 154–158. Available at: https://publisher.uthm.edu.my/periodicals/index.php/mari/article/view/5086 (Accessed: 30 June 2022).