Authors
Piotr Kulesza
The John Paul II Catholic University of Lublin, Poland
Małgorzata Żak-Kulesza
The John Paul II Catholic University of Lublin, Poland
© 2019 Magdalena Lubiarz, Piotr Kulesza, Małgorzata Żak-Kulesza, published by Slovak University of Agriculture in Nitra
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.