Br Purba, Roh, Fenty Debora Napitupulu, & Usman Sidabutar. " IMPROVING STUDENT'S VOCABULARY MASTERY BY USING THE FLY SWATTER GAME IN SEVENTH GRADE OF SMP N 31 MEDAN." Jurnal Teknologi Mesin UDA [Online], 2.2 (2025): n. pag. Web. 1 Jun. 2025