ELA, Mehmet. An Assessment on the Relationship Between Informal Economy and Educational Level in Turkey. International Journal of Economics and Financial Issues, [S. l.], v. 3, n. 4, p. 910–922, 2013. Disponível em: https://www.econjournals.com.tr/index.php/ijefi/article/view/610. Acesso em: 23 jul. 2025.