Kozmáné Petrilla, Gréta. “Analysis of the Environmental Status of Nagykálló Subregion”. Acta Agraria Debreceniensis0, no. 16 (December 6, 2005): 362-367. Accessed November 26, 2020. https://ojs.lib.unideb.hu/actaagrar/article/view/3336.