Tomšič, Marija, France Sevšek, and Darja Rugelj. “Travelling Habits and Perceived Limitations of Older City Bus Users”. Promet - Traffic&Transportation 29, no. 4 (September 4, 2017): 425-431. Accessed July 6, 2020. http://traffic.fpz.hr/index.php/PROMTT/article/view/2270.