1. Doctoral School of Economics and Regional Sciences, Hungarian University of Agriculture and Life Sciences, Páter Károly u. 1, 2100 Gödöllo, Hungary
2. College of Law and Administration, International Trade, University of Halabja, Ababaile Village, Halabja 46018, Kurdistan Region, Iraq
3. Department of Methodology for Business Analysis, Faculty of Commerce, Hospitality and Tourism, Budapest Business University, Alkotmány utca 9-11, 1054 Budapest, Hungary