Surawongtakoon, P., P. Paha, and W. Pormsila. “Lower Density Solvent-Based Dispersive Liquid-Liquid Microextraction for the Determination of Benzoic Acid”. Research on Modern Science and Utilizing Technological Innovation Journal (RMUTI Journal), vol. 11, no. 2, Aug. 2018, pp. 14-24, https://ph01.tci-thaijo.org/index.php/rmutijo/article/view/167658.