Panjaitan, Andre Bona Josua, Ikhsan Ramadhan Hasibuan, and Yenita Sembiring. 2022. “USING NUMBERED HEADS TOGETHER COOPERATIVE LEARNING AS SPEAKING STRATEGY”. ELT (English Language Teaching Prima Journal) 3 (2):62-85. https://doi.org/10.34012/elt.v%vi%i.2433.