Wannalai, S., S. Nokaew, and W. Siriwong. “Assessment of Knowledge and Perception of Adverse Health Effects Associated With Self-Prevention from Air Pollution in Traffic Policemen in Bangkok, Thailand”. Journal of Health Research, vol. 30, no. Suppl. 2, Mar. 2017, pp. S147-S152, https://he01.tci-thaijo.org/index.php/jhealthres/article/view/80737.