DEVELOPMENT OF THE HUMAN BLOOD CIRCULATION SYSTEM BOOKLET AS A TEACHING MATERIAL SUPPLEMENT OF NATURAL SCIENCE FOR CLASS VIII SMP / MTs. UNIVERSE [Internet]. 30 Desember 2021 [dikutip 23 Oktober 2026];2(2):192-7. Tersedia pada: http://universe.ppj.unp.ac.id/index.php/universe/article/view/87