“Case Study of Second Language Acquisition: What Contributes to Speaking Proficiency”. INOVATIF: Jurnal Penelitian Pendidikan, Agama, dan Kebudayaan 5, no. 1 (February 2, 2019): 95–108. Accessed January 31, 2026. http://jurnal.iaih.ac.id/index.php/inovatif/article/view/93.