“The Application of Group Discussion Method to Improvr the Students’ Achievement on Speaking Skills of Seventh Grade at SMPN 4 Pematangsiantar”. Bilingual : Jurnal Pendidikan Bahasa Inggris 7, no. 2 (Oktober 29, 2025): 111 – 119. Diakses Oktober 31, 2025. http://jurnal.usi.ac.id/index.php/jbl/article/view/1998.