Mohd Yusof, Amirul Anniq, et al. “Effect of Recycled Waste Cooking Oil on the Tensile Properties of RPET Filaments for FDM Applications”. Politeknik & Kolej Komuniti Journal of Engineering and Technology, vol. 10, no. 2, Nov. 2025, pp. 1-11, https://app.mypolycc.edu.my/journal/PMJET/article/view/808.