SAEED, Aziz Thabit. Arab EFL Learners’ Acquisition of Modals. Research in Language, [S. l.], v. 7, p. 75–98, 2009. DOI: 10.2478/v10015-009-0006-5. Disponível em: https://www.czasopisma.uni.lodz.pl/research/article/view/8190. Acesso em: 15 feb. 2026.