Rachmat, M. “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, Vol. 2, no. 2, Oct. 2020, pp. 1-9, http://jurnal.sman1parung.sch.id/index.php/jar/article/view/18.