Wertsch,
James. Mind as Action. New York: Oxford, 1998.
Tag: Vygotsky
Engeström, “Activity Theory and Individual and Social Transformation”
Engeström,
Yrjö. "Activity Theory and Individual and Social Transformation."
Engeström, Yrjö, et al., eds. Perspectives on Activity
Theory: Learning in Doing: Social, Cognitive & Computational Perspectives.
New York: Cambridge UP, 1999. 19-39.