Dostatny, Denise F. “Diversity of Field Weeds Within Nadnidziański Ladscape Park, Its Conditions and Protection. Part II - the Effect of Tillage Systems on Diversity of Weeds in Root and Fodder Crops”. Plant Breeding and Seed Science, vol. 54, Dec. 2006, pp. 65-75, http://ojs.ihar.edu.pl/index.php/pbss/article/view/643.