RISTATI, .-. The difficulties in pronunciation of fricatives [f] and [v] by learners of English whose first language is Dayak Ngaju: Applied linguistics. International journal of linguistics, literature and culture, [S. l.], v. 3, n. 1, p. 47–55, 2017. Disponível em: https://sloap.org/journals/index.php/ijllc/article/view/190. Acesso em: 16 jul. 2024.