2022. Study of Critical Thinking Skills for Junior High School Students In the Era Industial Revolution 4.0. JIPFRI (Jurnal Inovasi Pendidikan Fisika dan Riset Ilmiah). 6, 1 (Jun. 2022), 19–23. DOI:https://doi.org/10.30599/jipfri.v6i1.1255.