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http://www.lodestone.com/tips/biblio.htm

Participatory Design: Principles and Practices 
by Douglas Schuler and Aki Namioka (editor)
Published by Lawrence Erlbaum Assoc
Publication date: October 1992
ISBN: 080580952X

Design at Work: Cooperative Design of Computer Systems
by Joan Greenbaum , Morten Kyng (Editor) 
Published by Lawrence Erlbaum Assoc
Publication date: April 1991
ISBN: 0805806121