Wichiensin, Muanmas, and Kroekkiat Angkanawisalya. “Effect of Congestion Charging on Traffic Condition in the Inner Area of Bangkok”. Science and Engineering Connect 43, no. 1 (March 31, 2020): 3–16. accessed July 9, 2025. https://ph04.tci-thaijo.org/index.php/SEC/article/view/10619.