Sacko, Makan, and Youssouf Haidara. “Developing Autonomous Listening Learning Materials for University Students TOEFL Preparation”. LingTera 5, no. 2 (October 23, 2018): 170–178. Accessed May 15, 2025. https://journal.uny.ac.id/index.php/ljtp/article/view/10192.