Sitanggang, Cansa Namira, and Maslathif Dwi Purnomo. “Indonesian EFL Students’ Perspective on Free4Talk: A Novice Vs. Expert User Study”. Jurnal Onoma: Pendidikan, Bahasa, dan Sastra 11, no. 3 (August 26, 2025): 3783–3796. Accessed September 11, 2025. https://e-journal.my.id/onoma/article/view/6844.