Johari, I. N. S. ., and N. A. Badarulzaman. “Evaluation of Flexural and Flame Retardant Properties of Recycled Polyethylene Terephthalate – Silica Sand Composites”. Research Progress in Mechanical and Manufacturing Engineering, vol. 2, no. 2, Jan. 2022, pp. 96-103, https://publisher.uthm.edu.my/periodicals/index.php/rpmme/article/view/3673.