Suyanto, Agus. “The Effect of Cooperative Learning on Reasoning Ability and Mastery of Mathematical Concepts”. EDUCATIO : Journal of Education 6, no. 1 (May 30, 2021): 70-78. Accessed October 10, 2025. https://ejournal.staimnglawak.ac.id/index.php/educatio/article/view/362.