K. Meng, T., D. Y.Y. Beng, A. S. Mohd Kassim, A. H. A. Razak, and N. A. Mohd Fauzi. 2019. “Optimization of Polystyrene Biodegradation Using Response Surface Methodology (RSM) Measured by Simple Colorimetric Method”. International Journal of Engineering & Technology 7 (4.14): 216-20. https://doi.org/10.14419/ijet.v7i4.14.27567.