Maulana, Y. et al. 2022. Development and Validation of Student Worksheets Air Theme based on the RADEC Model and 4C Skill-oriented. Jurnal Penelitian Pendidikan IPA. 8, 3 (Jul. 2022), 1605–1611. DOI:https://doi.org/10.29303/jppipa.v8i3.1772.