Mikula, Miroslav. “Razvitak Sredstava Za plaćanje Unaprijed korištenja Javnih Telefonskih Aparata S Automatskom Naplatom”. Promet - Traffic&Transportation 4, no. 2 (October 11, 2012): 35–39. Accessed February 27, 2026. https://traffic2.fpz.hr/index.php/PROMTT/article/view/1703.