Marpaung, Dea, and Agus Widyantoro. “EFL Learners’ Big Five Personalities, Language Learning Strategies, and Speaking Skills”. Indonesian Journal of EFL and Linguistics 5, no. 1 (May 28, 2020): 73-96. Accessed September 11, 2025. https://www.indonesian-efl-journal.org/index.php/ijefll/article/view/224.