Yesika Raya Hutagaol, Debbi Petra Manahara Sitorus, and Binsar Tison Gultom, “Numbered Head Together Learning Model (NHT) In Improving Student Learning Outcomes in Social Sciences Subjects Class VII UPTD SMP Negeri 7 Pematang Siantar FY 2023/2024”, IJIST, vol. 1, no. 4, pp. 505–518, Oct. 2023.