Cieślik, I., E. Cieślik, A. Siembida, and M. Tomczyk. “Evaluation of Services’ Quality in Upper Silesia Accommodation Facilities”. Journal of Agribusiness and Rural Development, Vol. 30, no. 4, Dec. 2013, pp. 21-36, http://www1.up.poznan.pl/jard/index.php/jard/article/view/664.