“THE DEVELOPMENT OF E-MODULES PROBLEM BASED LEARNING USING GOOLE CLASSROOM FOR BASIC ELECTRICITY AND ELECTRONICS AT VOCATIONAL SCHOOL”. CYBERSPACE: Jurnal Pendidikan Teknologi Informasi, vol. 4, no. 2, Oktober 2020, hlm. 84-93, https://doi.org/10.22373/cj.v4i2.7861.