V. Kaptelinen and B. Nardi, Acting with Technology: Activity Theory and Interaction Design. Amazon Media sarl, 2006.

H. Beyer and K. Holtzblatt, Contextual design, interactions, vol.6, issue.1, 1998.
DOI : 10.1145/291224.291229

K. Holtzblatt, Rapid Contextual Design, Ubiquity, vol.2005, issue.March, 2004.
DOI : 10.1145/1066348.1066325

B. Nardi, Context and Consciousness: Activity Theory and Human-Computer Interaction, 1995.