Utami, Wulan Aprilia, et al. “Validity and Practicality of Discovery Learning E-Modules on Environmental Change Material to Empower Critical Thinking Skills ”. Jurnal Penelitian Pendidikan IPA, vol. 8, no. 3, July 2022, pp. 1593-8, doi:10.29303/jppipa.v8i3.1726.