Authors
Aleksandra Szpulak
Katedra Prognoz i Analiz Gospodarczych, Uniwersytet Ekonomiczny we Wrocławiu,, Wrocławiu, Poland
© 2017 Aleksandra Szpulak, published by University of Information Technology and Management in Rzeszow
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.