?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.au=Nantha+Kumar+%2C+Subramaniam&rft.aulast=Nantha+Kumar+&rft.aufirst=Subramaniam&rft.date=17+May+2010&rft.title=Design+of+an+Expert+System+to+Enhance+Learners'+Critical+Thinking+in+a+Task-based+Online+Discussion&rft.genre=proceeding