“Further Insight into Student Learning Outcomes of Derivative Materials: Numbered Head Together and Expository Learning Model ”. Utamax : Journal of Ultimate Research and Trends in Education 4, no. 2 (July 27, 2022): 135–145. Accessed December 1, 2025. https://journal.unilak.ac.id/index.php/UTAMAX/article/view/9918.