Comparative Study on Flat Tax and Progressive Tax in Albania. Journal of Educational and Social Research, London, U.K., v. 13, n. 3, p. 354, 2023. DOI: 10.36941/jesr-2023-0083. Disponível em: https://www.richtmann.org/journal/index.php/jesr/article/view/13360.. Acesso em: 18 jul. 2024.