Published Online: Dec 19, 2018
Page range: 112 - 114
DOI: https://doi.org/10.2478/ppsr-2018-0010
© 2018 Agnieszka Makarewicz-Marcinkiewicz, published by Sciendo
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.
Agnieszka Makarewicz-Marcinkiewicz
University of Wrocław,
Wrocław, Poland