Kramarova, Katarina, Lubica Gajanova, and Elena Gregova. “Chosen Aspects of the Shadow Economy in the World and in Slovakia”. Global Journal of Business, Economics and Management: Current Issues 6, no. 2 (November 4, 2016): 86–96. Accessed May 18, 2024. https://www.un-pub.eu/ojs/index.php/gjbem/article/view/1240.