Production Management and Business Development: Proceedings of the 6th annual international scientific conference on marketing management, trade, financial and social aspects of business (MTS2018), 17-19 may 2018, Košice, Slovak Republic and Užhorod, Ukrajine / editors Bohuslava Mihalčová, Petra Szaryszová, Lenka Štofová . Leiden :  Taylor & Francis Group , 2019 . 257 s . ISBN 978-1-138-60415-5 .