Azizah, Nur, and Sudiran Sudiran. “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 2, no. 1 (August 30, 2017): 1–18. Accessed November 22, 2024. https://ejournal.umm.ac.id/index.php/celtic/article/view/4672.