THE DEVELOPMENT OF LKPD INTEGRATED SCIENCE BASED ON PROBLEM BASED LEARNING (PBL) OF THE INTEGRATED CRITICAL THINGKING SKILL ON THE TOPIC PRESSURES OF SUBTANCES FOR JUNIOR HIGH SCHOOL. universe [Internet]. 2020 Dec. 16 [cited 2026 Aug. 13];1(2):72-8. Available from: http://universe.ppj.unp.ac.id/index.php/universe/article/view/19