Ruqiah Ganda Putri Panjaitan (2021) “Developing picture storybook in the human excretory system concepts for improving students’ interests science learning”, Elementary Education Online, 20(1), pp. 1205–1214. Available at: https://ilkogretim-online.org/index.php/pub/article/view/3658 (Accessed: 15 January 2025).