Kućmierz, P.K., Mazurkiewicz, Łukasz and Walanus, A. (2014) “Selected economic factors impacting tourist travel in Poland between 2000 and 2012 and a forecast for 2013–2017”, Geotourism/Geoturystyka, (36), p. 25. doi:10.7494/geotour.2014.36.25.