?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.au=Ng+%2C+Richard&rft.aulast=Ng+&rft.aufirst=Richard&rft.date=14+November+2011&rft.title=Engaging+the+Open+Distance+Learners+%3A+a+strategy+to+increase+retention+and+improve+graduation+rates&rft.genre=proceeding