YUSJAH, M. N. N. .; ABD KAHAR, H. .; AMAT RITHUAN, M. Z. . Smart Step Ladder. Multidisciplinary Applied Research and Innovation, [S. l.], v. 2, n. 3, p. 154–158, 2021. Disponível em: https://publisher.uthm.edu.my/periodicals/index.php/mari/article/view/5086. Acesso em: 30 jun. 2022.