imara, salsabila yulia. “Validity of the Corporate Edition Flip PDF Assisted Learning E-Module for Improving Students’ Critical Thinking Skills”. Hydrogen: Jurnal Kependidikan Kimia 13, no. 4 (September 3, 2025). Accessed September 29, 2025. https://ojspanel.undikma.ac.id/index.php/hydrogen/article/view/16830.