Himmawati A, Azis DK. Implementation of Product Differentiation Strategy in Social Studies Lessons on Economic Activities for Fourth Grade Students at MI Miftahul Athfal Kebarongan. IJSSE [Internet]. 2026 Jan. 8 [cited 2026 Apr. 3];4(1):19-38. Available from: https://aisrr-ijsse.net/index.php/jsse/article/view/116