Polish Journal of Sport and Tourism
Polish Journal of Sport and Tourism > 2013 > 20 > 1 > 68-72
Polish Journal of Sport and Tourism > 2013 > 20 > 1 > 58-62
Polish Journal of Sport and Tourism > 2013 > 20 > 1 > 68-72
Polish Journal of Sport and Tourism > 2013 > 20 > 1 > 58-62