Não informado. (1999). System development. Applied Computer Research.
Chicago-viite (17. p.)Não informado. System Development. Phoenix, Ariz: Applied Computer Research, 1999.
MLA-viite (8. p.)Não informado. System Development. Applied Computer Research, 1999.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.