Tri Mulyo, Bagus, and Heri Yudiono. “Toughness Analysis of Pineapple Leaves Fiber Composite As Alternative Material for SNI Helmet”. Journal of Mechanical Engineering and Sciences 13, no. 4 (December 30, 2019): 5961–5972. Accessed November 22, 2024. https://journal.ump.edu.my/jmes/article/view/573.