Purboputro, Pramuko Ilmu, and Muh. Alfatih Hendrawan. “Increasing Torque Capacity on Clutch Made From Coconut Fiber Composite: Peningkatan Kapasitas Torsi Pada Kopling Berbahan Komposit Sabut Kelapa”. Prosiding University Research Colloquium, vol. 18, Feb. 2024, pp. 1-6, https://repository.urecol.org/index.php/proceeding/article/view/2947.