Bieniasz, A., D. Czerwińska-Kayzer, and Z. Gołaś. “Analysis of Enterprise Profitability With Application of Method of Diversifying”. Journal of Agribusiness and Rural Development, Vol. 9, no. 3, Dec. 2008, pp. 23-32, http://www1.up.poznan.pl/jard/index.php/jard/article/view/924.