IDRIS, MOHD DANIAL FAYYADH BIN, and Mohd Faizal Esa. “Design, Analysis and Optimization Using Solidwork Simulation of Chair Ladder”. Progress in Engineering Application and Technology 2, no. 2 (December 5, 2021): 947–957. Accessed August 15, 2026. https://periodical.uthm.edu.my/index.php/peat/article/view/946.