Polish Journal of Sport and Tourism
Polish Journal of Sport and Tourism > 2011 > 18 > 3 > 234-238
Polish Journal of Sport and Tourism > 2011 > 18 > 4 > 311-314
Polish Journal of Sport and Tourism > 2011 > 18 > 3 > 234-238
Polish Journal of Sport and Tourism > 2011 > 18 > 4 > 311-314