Sagala P, Tarigan L, Padang I, Lumbangaol D. Workshop of Improving Teachers’ Competency in Teaching Speaking by Using Buzz Group at SMA Kristen Kalam Kudus Medan. . JAM [Internet]. 2022 Mar. 10 [cited 2026 Apr. 21];1(1):77-88. Available from: https://journal.eltaorganization.org/index.php/ecdj/article/view/100