Dwihantoro, A. “Students Team Achievement Division (STAD): Model Pembelajaran Kooperatif Untuk Meningkatkan Kerja Sama Peserta Didik”. Quadratic: Journal of Innovation and Technology in Mathematics and Mathematics Education, vol. 1, no. 1, Apr. 2021, pp. 23-30, doi:10.14421/quadratic.2021.011-04.