Teesta Dey, and Dr. Sukla Bhaduri. “CHANGING PROFILE OF STATE TRANSPORT UNDERTAKINGS IN MASS TRANSPORT SERVICES: A CASE OF KOLKATA CITY”. Researchers World - International Refereed Social Sciences Journal, vol. 3, no. 2(1), Sept. 2021, pp. 45-56, https://www.researchersworld.com/index.php/rworld/article/view/587.