Putri, Fitriani Utami, and Skunda Diliarosta. “Development Of The Human Reproductive System Booklet As A Supplement To Natural Science Teaching Material Class IX SMP MTs”. Universe 2, no. 1 (June 16, 2021): 10–17. Accessed June 11, 2026. http://universe.ppj.unp.ac.id/index.php/universe/article/view/33.