“The Effect of Addition of Powder Areca Nut Midrib on Polyester Matrix to the Tensile and Bending Strength”. Jurnal Teknik Mesin 10, no. 1 (April 30, 2020): 1–5. Diakses September 11, 2025. https://jtm.itp.ac.id/index.php/jtm/article/view/479.