Authors
Iwona Batyk
University of Warmia and Mazury in Olsztyn, Faculty of Economics
Małgorzata Woźniak
University of Warmia and Mazury in Olsztyn, Faculty of Enviromental Science
© 2019 Iwona Batyk, Małgorzata Woźniak, published by John Paul II University of Applied Sciences
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.