Sele, Yunawati. “Optimizing the Potential of Children Learning in Science (clis) With Brain Gym: Review on Human Circulatory Concepts”. Biosfer: Jurnal Pendidikan Biologi 12, no. 2 (November 19, 2019): 238 - 248. Accessed May 3, 2025. http://103.8.12.212:33180/unj/index.php/biosfer/article/view/11864.