Aziz Rizqi Pratama, Muhammad, Edy Cahyono, and Yustinus Ulung Aggraito. 2019. “Implementation of Problem Based Learning Model to Measure Communication Skills and Critical Thinking Skills of Junior High School Students”. Journal of Innovative Science Education 8 (3), 324 -31. https://doi.org/10.15294/jise.v8i1.30788.