Difficult Sounds in Ibibio 2 ½ To 4 ½ Years Old Monolingual Children: Pedagogical and Clinical Implications. Journal of Educational and Social Research, London, U.K., v. 1, n. 3, p. 141, 2011. Disponível em: https://www.richtmann.org/journal/index.php/jesr/article/view/11739.. Acesso em: 3 may. 2024.