Muchammad Husni, dan Endang Susilowati. “SISTEM E-LEARNING DALAM PEMBELAJARAN IBT TOEFL (INTERNET BASE TEST OF ENGLISH AS A FOREIGN LANGUAGE) MENGGUNAKAN MEDIA VOIP (VOICE OVER INTERNET PROTOCOL)”. Jurnal Sosial Humaniora 4, no. 2 (Maret 7, 2025): 195–212. Diakses Mei 2, 2026. https://journal.its.ac.id/index.php/jsh/article/view/2959.