Zebua, Wirdayanti, et al. “Analysis of Cognitive Mathematics Learning Outcomes Using the Number Head Together (NHT) Model at SMP Negeri 1 Gunungsitoli Idanoi Academic Year 2021 2022”. QISTINA: Jurnal Multidisiplin Indonesia, vol. 2, no. 1, June 2023, pp. 199-05, doi:10.57235/qistina.v2i1.568.