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 16 Agustus 2026];2(2):192-7. Tersedia pada: http://universe.ppj.unp.ac.id/index.php/universe/article/view/87