Saragih ND, Bukit N, Sriadhi S. THE EFFECTIVENESS OF LKPD IPA BASED ON SCIENCE PROCESS SKILLS TO IMPROVE STUDENTS’ CRITICAL THINKING SKILLS ON SINGLE SUBSTANCE AND MIXED SUBSTANCES MATERIAL. JITeunuleh [Internet]. 2022Mar.28 [cited 2026Apr.17];3(1):61-8. Available from: https://teunulehjournal.com/index.php/jiteunuleh/article/view/99