Nilyani, K. and Ratnawulan 2023. Validity of the Physics E-Module on Alternative Energy and Global Warming for Class X Based on an Integrated Problem Based Learning Model integrated 21st Century Learning . Jurnal Penelitian Pendidikan IPA. 9, 11 (Nov. 2023), 10022–10027. DOI:https://doi.org/10.29303/jppipa.v9i11.5512.