Kim, Jun-Hyuk, and Soonhu Soh. “Designing Hub-and-Spoke School Bus Transportation Network: A Case Study of Wonkwang University”. Promet - Traffic&Transportation 24, no. 5 (September 25, 2012): 389–394. Accessed August 26, 2025. https://traffic2.fpz.hr/index.php/PROMTT/article/view/2359.