Nasution, Ade Irwansyah, Rohani, and Dwi Wulan Tristiana. 2021. “Modification Of The Model Problem Solving Learning With The Approach Of Offline in Class X Private SMK Az Zahra Sonomartani”. International Journal Of Humanities Education and Social Sciences 1 (2). https://doi.org/10.55227/ijhess.v1i2.40.