Authors
Grzegorz Maciejewski
grzegorz.maciejewski@ue.katowice.pl
University of Economics in Katowice, Market and Consumption Department, Maja, Katowice, Poland
grzegorz.maciejewski@ue.katowice.pl
© 2018 Grzegorz Maciejewski, published by Poznań University of Economics and Business Press
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.