?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.aufirst=Sadra&rft.aulast=Hamida&rft.au=Hamida%2C+Sadra&rft.atitle=The+Validity+of+Contextual-Based+Physics+Learning+Videos+to+Improve+Students'+4C+Skills&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=175-184&rft.genre=article