?url_ver=Z39.88-2004&rft_id=10.1109%2FCHUSER.2012.6504378&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.aufirst=W.F.W.&rft.aulast=Ahmad&rft.au=Ahmad%2C+W.F.W.&rft.title=Enhancing+3D+visualization+for+learning+volumes+of+solid%2C+an+application+in+integral+calculus%3A+A+multimedia+courseware+development&rft.date=2012&rft.isbn=9781467346153&rft.genre=proceeding