Yaowabut, N., P. Kongtip, and W. Yoosook. “Modified Method for Determination of PAHs in Ambient Air in Bangkok Using Gas Chromatography-Mass Spectrometry”. Journal of Health Research, vol. 26, no. 1, Apr. 2017, pp. 7-13, https://he01.tci-thaijo.org/index.php/jhealthres/article/view/84625.