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 > 4 > 279-282
Polish Journal of Sport and Tourism > 2013 > 20 > 1 > 68-72
Polish Journal of Sport and Tourism > 2013 > 20 > 4 > 279-282