THE EFFECT OF PROJECT BASED LEARNING MODEL ON COGNITIVE SKILL OF 8th GRADE STUDENTS’ ON DYGESTIVE SYSTEM TOPIC. universe [Internet]. 19 Maret 2024 [dikutip 14 Agustus 2026];4(2):173-6. Tersedia pada: http://universe.ppj.unp.ac.id/index.php/universe/article/view/551