Rachmat, M. (2020). WAYS TO IMPROVE THE UNDERSTANDING ON PHYSICS CONCEPT THROUGH PROBLEM-BASED LEARNING COMBINED WITH GOOGLE CLASSROOM ON KINETIC GAS IN GRADE XI SCIENCE 5 CIBINONG 3 HIGHSCHOOL. Wahana Journal of Action Research, 2(2), 1-9. Retrieved from http://jurnal.sman1parung.sch.id/index.php/jar/article/view/18