?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.aufirst=Putri+Bullquis&rft.aulast=Marsa&rft.au=Marsa%2C+Putri+Bullquis&rft.atitle=The+Validity+of+Contextual-Based+Learning+Videos+of+Wave+Material+to+Improve+Student's+Critical+Thinking%2C+Creative%2C+Collaboration%2C+and+Communication+Skill&rft.date=March+2021&rft.issn=2509-0119&rft.title=International+Journal+of+Progressive+Sciences+and+Technologies+(IJPSAT)&rft.volume=25&rft.issue=2&rft.pages=185-193&rft.genre=article