Skwarek, Janusz, and Andrzej Łygas. “Innovative Economy and Adult Education”. Regional Barometer. Analyses & Prognoses 11, no. 4 (December 31, 2013): 65–68. Accessed May 29, 2025. https://czaz.akademiazamojska.edu.pl/index.php/br/article/view/1093.