Necia Sitorus, Lisbet Novianti Sihombing, and Osco Parmonangan Sijabat, “Two Stay Two Stray Type Cooperative Learning Model on The Learning Outcomes of IPS Class V SD Students of Negeri 125138 Pematang Siantar”, IJIST, vol. 1, no. 3, pp. 243–252, Oct. 2023.