?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.aufirst=Tiara&rft.aulast=Viodelf&rft.au=Viodelf%2C+Tiara&rft.atitle=Improving+Students'+Critical+Thinking+Skills+Through+Buffer+Solutions+Module+Based+on+Scientific+Approaches+Assisted+Probing+Prompting+Questions+at+SMAN+1+Payakumbuh&rft.date=2+July+2019&rft.issn=2509-0119&rft.title=International+Journal+of+Progressive+Sciences+and+Technologies+(IJPSAT)&rft.volume=15&rft.issue=2&rft.pages=63-67&rft.genre=article