Muhamad, A., A. T. Abd. Karim, N. F. Zakaria, and K. Jonya Ak Rapok. “DETERMINATION OF PHTHALATE ESTER COMPOUNDS IN SEMBRONG RIVER SEDIMENT”. Journal of Techno-Social, vol. 8, no. 2, Dec. 2016, https://penerbit.uthm.edu.my/ojs/index.php/JTS/article/view/1517.