Szulc-Obłoza, Agnieszka. “Wage Regulations and Shadow Economy in 28 European Countries”. Ekonomia i Prawo. Economics and Law 19, no. 4 (December 31, 2020): 789–799. Accessed July 18, 2024. https://apcz.umk.pl/EiP/article/view/EiP.2020.051.