?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.aulast=Simon&rft.au=Simon%2C+Shirley&rft.aufirst=Shirley&rft.issue=5&rft.issn=0950-0693&rft.date=April+2008&rft.title=International+Journal+of+Science+Education&rft.volume=30&rft.atitle=Professional+Learning+Portfolios+for+Argumentation+in+School+Science&rft.pages=669-688&rft.genre=article