Bera, M. “Tourist Attractiveness of Rural Communes of Natural Values in the Warmińsko-Mazurskie and Podlaskie Voivodeships”. Journal of Agribusiness and Rural Development, Vol. 28, no. 2, Dec. 2013, pp. 5-12, http://www1.up.poznan.pl/jard/index.php/jard/article/view/610.