THE EFFECT OF PROJECT BASED LEARNING MODEL ON COGNITIVE SKILL OF 8th GRADE STUDENTS’ ON HUMAN CIRCULATORY SYSTEM TOPIC. universe [Internet]. 30 Juni 2023 [dikutip 16 Agustus 2026];4(1):127-31. Tersedia pada: http://universe.ppj.unp.ac.id/index.php/universe/article/view/552