Radnović, Branislav, Radenko Miloš Marić, Vladana Radnović, Milena Ilić, and Dragan Lukač. “Marketing Research on Passenger Satisfaction With Public Transport Service in the City of Belgrade”. Promet - Traffic&Transportation 27, no. 1 (March 2, 2015): 47-57. Accessed August 12, 2020. https://traffic.fpz.hr/index.php/PROMTT/article/view/1522.