PALCZEWSKA , Olga. Taxation of Income from Undeclared Sources as an Instrument for Combatting Tax Evasion in Poland. Studia Oeconomica Posnaniensia, Poznan, Polska, v. 4, n. 4, p. 54–69, 2016. DOI: 10.18559/SOEP.2016.4.4. Disponível em: https://journals.ue.poznan.pl/soep/article/view/3432. Acesso em: 3 sep. 2026.