About this article
Published Online: Jun 15, 2017
Page range: 34 - 42
Received: Jan 10, 2017
Accepted: Feb 24, 2017
DOI: https://doi.org/10.1515/pcssr-2017-0009
Keywords
© 2017 Szczepan Kościółek, published by De Gruyter Open
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.
Kościółek, Szczepan
University of EconomicsKraków, Poland