Nisak, Nikita Hoirun, and Ade Cyntia Pritasari. “Validity of Problem-Based E-Magazine on Human Digestive System for Primary School Science Learning”. BASICA 4, no. 2 (January 20, 2025): 57–72. Accessed February 10, 2026. https://ejournal.insuriponorogo.ac.id/index.php/basica/article/view/6371.