LUBIS, Azhar Aziz; SIREGAR, Masitowarni. IMPROVING STUDENTS™ ACHIEVEMENT IN SPEAKING THROUGH THE APPLICATION OF SMALL GROUP DISCUSSION METHOD (SGD). TRANSFORM : Journal of English Language Teaching and Learning, North Sumatera, Indonesia, v. 2, n. 4, 2014. DOI: 10.24114/tj.v2i4.949. Disponível em: https://jurnal.unimed.ac.id/2012/index.php/jelt/article/view/949. Acesso em: 19 jul. 2025.