Karim, Hafifi. “Improving Teacher Professionalism and Student Achievement in Economic Learning through the Understanding by Design (UbD) and Differentiated Instruction (DI) Model at Yapidh High School, Bekasi City”. FOCUS 5, no. 1 (February 7, 2024): 37–42. Accessed May 19, 2025. https://journal.neolectura.com/index.php/focus/article/view/1129.