Sőrés, Anett, and Károly Pető. “Analysis of the Objective Indicators of Quality of Life in Hajdú-Bihar County”. Applied Studies in Agribusiness and Commerce 4, no. 5-6 (December 31, 2010): 83–89. Accessed August 10, 2022. https://ojs.lib.unideb.hu/apstract/article/view/7670.