Muchammad Husni dan Endang Susilowati (2025) “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(2), hlm. 195–212. Tersedia pada: https://journal.its.ac.id/index.php/jsh/article/view/2959 (Diakses: 4 Mei 2026).