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Journal of Computer Assisted Learning > 40 > 1 > 89 - 103
The Internet and Higher Education > 2013 > 16 > Complete > 23-31
Computers & Education > 2012 > 59 > 2 > 774-784
Computers & Education > 2009 > 53 > 4 > 1138-1146
Computers & Education > 2008 > 50 > 4 > 1339-1353
Computers & Education > 2005 > 44 > 2 > 155-172
Computers & Education > 2000 > 35 > 4 > 251-262