The Effect of the Big Book Media-Based Discovery Learning Model on Class III Students’ Learning Outcomes on Theme 7 Technological Development at Agia Sophia Private Elementary School. PJR [Internet]. 2025 May 6 [cited 2025 May 9];9(1):49-67. Available from: https://pajar.ejournal.unri.ac.id/index.php/PJR/article/view/68