1. Blumer, H. Symbolic Interactionism: Perspective and Method. Berkeley: University of California Press, 1969.
2. Bowers, J. and Rodden, T. Exploding the interface. Proceedings of the ACM INTERCHI '93 Conference on Human Factors in Computing Systems, 1993; Amsterdam, The Netherlands; 255 - 262. Amsterdam: ACM Press.
3. COMIC Deliverable 2.1 Informing CSCW Requirements, Esprit Basic Research Project 6225; 1994; Lancaster University: Computing Department. ftp://ftp.comp.lancs.ac.uk/ pub/comic/
4. Crabtree, A. Designing Collaborative Systems: A Practical Guide to Ethnography, London: Springer-Verlag, 2003.
5. Duchenaut, N. and Bellotti, V. Email as habitat. Interactions 2001; 8 (5): 30 - 38.