Peraković, Dragan, Vladimir Remenar, and Zdravko Šašek. “Analysis of Operation and Possibilities of Improving E-Learning System in Traffic Engineering”. Promet - Traffic&Transportation 19, no. 3 (May 25, 2007): 167–172. Accessed August 26, 2025. https://traffic2.fpz.hr/index.php/PROMTT/article/view/2221.