Hardini, Cahyati Praba, and Sri Handayani. “USING NUMBERED HEADS TOGETHER TO IMPROVE STUDENTS’ VOCABULARY LEARNING OUTCOMES: A Classroom Action Research With The Students of SMP Islam Al - Hadi Sukoharjo”. English Research Journal : Journal of Education, Language, Literature, Arts and Culture 6, no. 2 (July 3, 2023). Accessed July 27, 2024. https://ejurnal.unisri.ac.id/index.php/engj/article/view/6124.