Hajdú, Zita. “The Correlation of Foreign Language Proficiency, Employment and Regional Competitiveness in the North Great Plain Region of Hungary”. Acta Agraria Debreceniensis, no. 26 (July 16, 2007): 74–82. Accessed December 2, 2022. https://ojs.lib.unideb.hu/actaagrar/article/view/3060.