Saragih, N. D., Bukit, N., & Sriadhi, S. (2022). THE EFFECTIVENESS OF LKPD IPA BASED ON SCIENCE PROCESS SKILLS TO IMPROVE STUDENTS’ CRITICAL THINKING SKILLS ON SINGLE SUBSTANCE AND MIXED SUBSTANCES MATERIAL. Jurnal Ilmiah Teunuleh , 3(1), 61-68. https://doi.org/10.51612/teunuleh.v3i1.99