Paulus Nainggolan, and Bornok Sinaga. “Development of Learning Videos to Improve Students’ Ability to Understand Mathematical Concepts on Polynomial Material”. JURNAL RISET RUMPUN ILMU PENDIDIKAN 2, no. 1 (April 27, 2023): 228–239. Accessed March 1, 2026. https://prin.or.id/index.php/JURRIPEN/article/view/1181.