About this article
Published Online: Oct 23, 2019
Page range: 3 - 7
DOI: https://doi.org/10.18559/ebr.2019.3.0
© 2019 Marian Gorynia, published by Sciendo
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.
Marian Gorynia
Poznań University of Economics and Business,