By Schellens T.   van Keer H.   Valcke M.   de Wever B.   in Behaviour and Information Technology

ISSN:1362-3001|26|1|55-71

Taylor & Francis Ltd‎(2007)‎

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By Schellens T.   Van Keer H.   De Wever B.   Valcke M.   in Interactive Learning Environments

ISSN:1049-4820|17|1|77-94

Routledge Ltd‎(2009)‎

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