Łuczak, A., and F. Wysocki. “Application of the Analytic Hierarchic Process in Analysis Motivation System of a Transport Firm”. Journal of Agribusiness and Rural Development, Vol. 10, no. 4, Dec. 2008, pp. 47-60, http://www1.up.poznan.pl/jard/index.php/jard/article/view/944.