SĘK, M. Informal Economy and VAT. Tax Law Quarterly, [S. l.], n. 1, p. 37–49, 2017. DOI: 10.18778/1509-877X.01.03. Disponível em: https://www.czasopisma.uni.lodz.pl/tax/article/view/4454. Acesso em: 20 may. 2024.