1. L. Eboli, G. Mazzulla, A Stated Preference Experiment for Measuring Service Quality in Public Transport, In: Transportation Planning and Technology, Rotledge publisher, member of the Taylor and Francis Group, Vol. 31, No. 5 (2008) 509-523.
2. M. Friman, M. Fellesson, Service Supply and Customer Satisfaction in Public Transportation: The Quality Paradox, University of South Florida, In: Journal of Public Transportation, Vol. 12, No. 4 (2009) 57-69.
3. V. Konecny, Tools and methods of quality management. Instructions for exercises from the course of the Quality Management, 1. ed., Zilina: University of Zilina, Slovak Republic, (2012).
4. J. Kralovensky, J. Gnap, M. Poliak, V. Konecny, Economics of Road and Urban Transport 1, University of Zilina, Slovak Republic, (2008).
5. V. Konecny, M. Kostolna, The possibilities of standardizing the quality level in public passenger transport from customer point of view, In: Perner´s Contacts, Vol. 9, No. 2 (2014).