Formal and Informal Language Expressions Used by English Students of Indonesia in Classroom Presentation-Interaction. Elsya : Journal of English Language Studies, [S. l.], v. 4, n. 1, p. 12–23, 2022. DOI: 10.31849/elsya.v4i1.8293. Disponível em: https://journal.unilak.ac.id/index.php/elsya/article/view/8293. Acesso em: 23 jun. 2026.