Janić, Milan, and Dmitar Grubor. “Kvalitet Usluga U železničkom saobraćaju država EZ, EFTA I SFRJ”. Promet - Traffic&Transportation, vol. 2, no. 5-6, Oct. 2012, pp. 331-5, https://traffic2.fpz.hr/index.php/PROMTT/article/view/1614.