et. al., A. S. . “Increasing the Cooperation Understanding of Students through Project-Based Learning Methods on Social Studies Subject in 3rd Grade SDN Pulogebang 06 Morning East Jakarta”. Turkish Journal of Computer and Mathematics Education (TURCOMAT), vol. 12, no. 11, May 2021, pp. 6866-73, doi:10.17762/turcomat.v12i11.7198.