Harianja, Clara Chyntia, Benjamin Albert Simamora, and Binsar Tison Gultom. 2023. “The Effect of the Numbered Heads Together (NHT) Cooperative Learning Model on Class VII Social Studies Learning Outcomes of SMP Negeri 5 Pematang Siantar T.A 2022/2023”. Indonesian Journal of Advanced Research 2 (6):665-76. https://doi.org/10.55927/ijar.v2i6.4713.