Authors
Zygmunt.waskowski@ue.poznan.pl
Institute of Marketing, Poznań University of Economics and Business, Poznań, Poland
Zygmunt.waskowski@ue.poznan.pl
© 2022 Zygmunt Waśkowski, published by ŁUKASIEWICZ RESEARCH NETWORK – INSTITUTE OF AVIATION
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.