In: Justine Cassell; Joseph Sullivan; Scott Prevost; Elizabeth Churchill (Hrsg.). Embodied Conversational Agents. Chapter 8, Pages 220-255, ISBN 978-0-262-03278-0, MIT Press, 4/2000.
In: H. Lieberman, editor, Proceedings of the 2000 International Conference on Intelligent User Interfaces (IUI '2000), pages 21-28, New Orleans, USA, ACM Press. International Conference on Intelligent User Interfaces (IUI), 2000.