1. An introduction to SSADM Version 4;Ashworth,1993
2. Das V-Modell: der Standard für die Softwareentwicklung mit Praxisleitfäden,1993
3. Information technology—software packages—quality requirements and testing;International Standard ISO/IEC DIS 12119,1993
4. Capability maturity model for software;Paulk,1991
5. Quality management and quality assurance standards—Part 3: Guidelines for the application of ISO 9001 to the development, supply and maintance of software;International Standard ISO 9000-3,1991