?url_ver=Z39.88-2004&rft_id=10.1016%2Fj.sbspro.2010.12.086&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.au=Shafie%2C+A.&rft.aufirst=A.&rft.aulast=Shafie&rft.issn=18770428&rft.title=Design+and+heuristic+evaluation+of+MathQuest%3A+A+role-playing+game+for+numbers&rft.date=2010&rft.genre=proceeding