“IMPROVEMENT OF STUDENTS’ SCIENCE PROCESS SKILLS IN SCAFFOLDING-BASED PROBLEM BASED LEARNING ON THE MATERIAL OF TRAVELLING WAVES AND STATIONARY WAVES”. SPEKTRA: Jurnal Kajian Pendidikan Sains 11, no. 1 (March 9, 2026): 49–61. Accessed May 28, 2026. https://ojs.unsiq.ac.id/index.php/spektra/article/view/7812.