1. ISO, ISO 10303: 1994, Industrial Automation Systems and Integration—Product Data Representation and Exchange. (The ISO web site is at http://www.iso.ch/cate/cat.html—search on 10303 to find a list of parts of the standard).
2. Owen, J., STEP: An Introduction, Information Geometers, Winchester, UK, 2nd ed., 1997 (ISBN 1-874728-04-6).
3. Kemmerer, S. J., Ed., STEP: The Grand Experience, NIST Special Publication SP 939, US Government Printing Office, Washington, DC 20402, July 1999.
4. PDES Inc., Success stories, http://pdesinc.aticorp.org
5. Schenk, D. A., and Wilson, P. R., Information Modeling: The EXPRESS Way, Oxford University Press, New York, NY, 1994 (ISBN 0-19-508714-3).