?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.aulast=Sfard&rft.aufirst=Anna&rft.au=Sfard%2C+Anna&rft.pages=14-22&rft.atitle=Telling+identities%3A+In+Search+of+an+Analytic+Tool+for+Investigating+Learning+as+a+Culturally+Shaped+Activity&rft.volume=34&rft.title=Educational+Researcher&rft.date=May+2005&rft.issue=4&rft.genre=article