Jantakard, H., and S. Siridhara. “DETERMINING WILLINGNESS-TO-PAY FOR IN-VEHICLE TRAVEL TIME OF TRAVELLERS IN SALAYA DISTRICT”. Suranaree Journal of Science and Technology, vol. 25, no. 3, Aug. 2026, pp. 213-24, https://ph04.tci-thaijo.org/index.php/SUJST/article/view/14496.