Panjaitan, Andre Bona Josua, Ikhsan Ramadhan Hasibuan, and Yenita Sembiring. “USING NUMBERED HEADS TOGETHER COOPERATIVE LEARNING AS SPEAKING STRATEGY”. ELT (English Language Teaching Prima Journal) 3, no. 2 (February 11, 2022): 62-85. Accessed July 3, 2024. https://jurnal.unprimdn.ac.id/index.php/ELTP/article/view/2433.