Authors
Sylwia Szopa
Poland
Agnieszka Kowalczyk
Poland
© 2016 Krzysztof Sas-Nowosielski, Sylwia Szopa, Agnieszka Kowalczyk, published by University of Physical Education in Warsaw
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.