Kumar, Saurabh, and Sanjeev Sinha. “Willingness to Pay for Improvement in Service Quality of Intermediate Public Transport (IPT) Modes”. Civil Engineering Journal 7, no. 5 (May 1, 2021): 866–879. Accessed September 21, 2025. https://www.civilejournal.org/index.php/cej/article/view/2717.