Siburian, Rosinta, Sinta Dameria Simanjuntak, and Frida Marta Simorangkir. “Effectiveness of Online Differentiated Instruction in Term of students’ Mathematical Problem Solving Ability”. Jurnal Riset Pendidikan Matematika 9, no. 1 (May 31, 2022). Accessed June 14, 2025. https://journal.uny.ac.id/index.php/jrpm/article/view/44439.