Lubis, Azhar Aziz, and Masitowarni Siregar. “IMPROVING STUDENTS™ ACHIEVEMENT IN SPEAKING THROUGH THE APPLICATION OF SMALL GROUP DISCUSSION METHOD (SGD)”. TRANSFORM: Journal of English Language Teaching and Learning 2, no. 4 (December 31, 2013). Accessed December 15, 2025. https://jurnal.unimed.ac.id/2012/index.php/jelt/article/view/949.