Ward, P. T. (1984). Systems development without pain: A user's guide to modeling organizational patterns. Yourdon Press.
Chicago-viite (17. p.)Ward, Paul T. Systems Development Without Pain: A User's Guide to Modeling Organizational Patterns. New York: Yourdon Press, 1984.
MLA-viite (9. p.)Ward, Paul T. Systems Development Without Pain: A User's Guide to Modeling Organizational Patterns. Yourdon Press, 1984.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.