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Ang, C.S., Zaphiris, P. & Wilson, S. (2011). A case study analysis of a constructionist knowledge building community with activity theory. Behaviour and Information Technology, 30(5), pp. 537-554. doi: 10.1080/0144929X.2010.490921
Ang, C.S. (2007). Social interactions of computer games : an activity framework. (Unpublished Doctoral thesis, City University London)