PIEKOT, Tomasz. Readability research: Past and present. Poradnik Językowy, [S. l.], v. 830, n. 1, p. 104–115, 2026. Disponível em: https://www.journals.polon.uw.edu.pl/index.php/pj/article/view/2019. Acesso em: 16 sep. 2026.