Batubara, Riska Widiyanita, Amrin Batubara, and Tri Yuli Ardiyansah. “Enhancing Idiomatic Competence through WhatsApp: A Comparative Study of Mobile and Traditional Teaching Methods”. Jurnal Evaluasi dan Pembelajaran 6, no. 2 (January 31, 2025): 88–97. Accessed July 26, 2025. https://jepjurnal.stkipalitb.ac.id/index.php/hepi/article/view/255.