“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, vol. 11, no. 1, May 2025, pp. 49-61, https://doi.org/10.32699/spektra.v11i1.7812.