THE EFFECT OF THE PBL LEARNING MODEL BASED ON SCIENCE, TECHNOLOGY, ENGINEERING, MATHEMATICS (STEM) ON THE COGNITIVE ABILITIES OF JUNIOR HIGH SCHOOL STUDENTS 1 BASA AMPEK BALAI TAPAN. universe [Internet]. 31 Juli 2022 [dikutip 13 Agustus 2026];3(1):14-9. Tersedia pada: http://universe.ppj.unp.ac.id/index.php/universe/article/view/134