Permana, Ariva Sugandi, and Arthit Petchsasithon. “Assessing the Seamlessness of Bangkok Metropolitan Public Transport by Using Modified Quantitative Gap Analysis”. International Journal of Built Environment and Sustainability 7, no. 1 (December 31, 2019): 81–97. Accessed August 11, 2022. https://ijbes.utm.my/index.php/ijbes/article/view/440.