Kierczyńska, Sylwia, and Julian Wawrzyniak. “The Level of Apple Production Costs and the Economic Effects in the Selected Orchard Management Systems”. Journal of Agribusiness and Rural Development 3, no. 359 (December 31, 2004): 83-89. Accessed April 28, 2024. http://www1.up.poznan.pl/jard/index.php/jard/article/view/1020.