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).
6.
NIST, STEP-on-a-page, http://www.mel.nist.gov/sc5/soap/
7.
NIST, STEP Online Information Server, http://www.nist.gov/sc4/
8.
USPro, Home page, https://www.uspro.org  
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