?url_ver=Z39.88-2004&rft_id=10.4186%2Fej.2021.25.2.269&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.au=Kamal%2C+A.A.A.&rft.aulast=Kamal&rft.aufirst=A.A.A.&rft.issn=01258281&rft.date=2021&rft.issue=2&rft.atitle=Extraction+of+gallic+acid+from+chromolaena+sp.+Using+ultrasound-assisted+extraction&rft.pages=269-276&rft.volume=25&rft.title=Engineering+Journal&rft.genre=article