Karina, Lira, et al. “Effectiveness of the Teams Games Tournament (TGT) Cooperative Learning Model on Students’ Mathematics Achievement”. Kognitif: Jurnal Riset HOTS Pendidikan Matematika, vol. 5, no. 3, Sept. 2025, pp. 1303-1, doi:10.51574/kognitif.v5i3.3457.