AZIZAH, N.; SUDIRAN, S. A Study on Diglossia Used by Helen Keller as The Main Character in George Sullivan’s Novel "Helen Keller". Celtic : A Journal of Culture, English Language Teaching, Literature and Linguistics, [S. l.], v. 2, n. 1, p. 1–18, 2017. DOI: 10.22219/celtic.v2i1.4672. Disponível em: https://ejournal.umm.ac.id/index.php/celtic/article/view/4672. Acesso em: 3 jul. 2024.