Testing the Effectiveness of “English Language” Course Book for Indonesian Senior High School Students. Elsya : Journal of English Language Studies, [S. l.], v. 1, n. 3, p. 102–109, 2020. DOI: 10.31849/elsya.v1i3.5023. Disponível em: https://journal.unilak.ac.id/index.php/elsya/article/view/5023. Acesso em: 1 jun. 2026.