“The Effect of Variation in the Composition of Candlenut Shell Charcoal Powder Epoksi Composite on Hardness Value, Friction Coefficient and Specific Wear Rate”. Jurnal Teknik Mesin 14, no. 1 (April 30, 2023): 33–37. Diakses Agustus 21, 2025. https://jtm.itp.ac.id/index.php/jtm/article/view/773.