Subekti, Adaninggar Septi, and Arida Susyetina. “IELTS Speaking Training for High School Teachers in Yogyakarta”. MATAPPA: Jurnal Pengabdian Kepada Masyarakat 3, no. 2 (September 28, 2020): 80–86. Accessed March 22, 2026. https://journal.matappa.ac.id/index.php/matappa/article/view/385.