1. Andersen PA, Guerrero LK (1998) Handbook of communication and emotions. Research, theory, applications and contexts. Academic Press, New York
2. Austin JL (1962) How to do things with words, 2nd edn, 2005. Harvard University Press, Cambridge (Mass)—Paperback
3. Bickmore T (2003) Relational agents: effecting change through human-computer relationships. PhD Thesis, Media Arts & Sciences, Massachusetts Institute of Technology
4. Bickmore T, Cassell J (2005) Social dialogue with embodied conversational agents. In: van Kuppevelt J, Dybkjaer L, Bernsen N (eds) Advances in natural, multimodal dialogue systems. Kluwer Academic, New York
5. Cassell J, Joseph S, Sott P, Churchill E (2000) Embodied conversational agents. The MIT Press, Cambridge. ISBN 0-262-03278-3