F. W. H. Saruksuk, L. N. Sihombing, and D. Sijabat, “The Influence of Numbered Head Together (NHT) Cooperative Learning Model on Student Learning Outcomes Theme 2 Subtheme 1 ‘Harmony in Differences’ in Class VI Students at UPTD SD Negeri 124385 Pematang Siantar”, IJGSR, vol. 1, no. 2, pp. 217–224, Oct. 2023.