7Chula Vista, Are the reported barriers to Intemet-based instruction warranteed?: A synthesis of recent research Education,Chris Piotrowski; Stephen J Vodanovich; Vol.121 (1) , Fall 2000.
8Lauris J Grace; Peter J Smith , Flexible delivery in the Australian vocational education and training sector. Barriers to success identified in case studies of four adult learners , Distance Education; Melbourne; Vol.22 (2) ,2001.
9Louise Kinross; Companies: Bloorview MacMillan CentreSic,Technology breaks down barriers , The Exceptional Parent;Boston; Jun 2000.
10Phil Race , The Opening Leaming Handbook , 1994.