T. K. Meng, D. Y.Y. Beng, A. S. Mohd Kassim, A. H. A. Razak, N. A. Mohd Fauzi, and . ., “Optimization of Polystyrene Biodegradation using Response Surface Methodology (RSM) Measured by Simple Colorimetric Method”, IJET, vol. 7, no. 4.14, pp. 216–220, Dec. 2019, doi: 10.14419/ijet.v7i4.14.27566.