Busabaa, Najat Ahmed, and Najla Abdullah Ateeg. “A Content Analysis of Modals in Action Pack Ten, Eleven, Twelve in Terms of Variety in Meaning, Distribution, and Activities: Recommendations for Effective Methods in Teaching Modals: Recommendations for Effective Methods in Teaching Modals”. Journal of ELT Research: The Academic Journal of Studies in English Language Teaching and Learning 5, no. 1 (June 5, 2020): 24–36. Accessed July 17, 2024. https://journal.uhamka.ac.id/index.php/jer/article/view/3863.