Polish Journal of Sport and Tourism
Polish Journal of Sport and Tourism > 2011 > 18 > 2 > 112-116
Polish Journal of Sport and Tourism > 2013 > 20 > 1 > 68-72
Polish Journal of Sport and Tourism > 2013 > 20 > 2 > 135-140
Polish Journal of Sport and Tourism > 2013 > 20 > 4 > 279-282