Tarmizi, Zatil Izzah, et al. “Fabrication of Hydrophilic Silica Coating Varnish on Pineapple Peel Fiber Based Biocomposite”. International Journal of Integrated Engineering, vol. 11, no. 7, Nov. 2019, pp. 77-82, https://publisher.uthm.edu.my/ojs/index.php/ijie/article/view/4436.