Collins, G., Blay, G., & Yearsley, R. Structured systems development techniques: Strategic planning to system testing.
Chicago-viite (17. p.)Collins, Garfield, Gillian Blay, ja Ronald Yearsley. Structured Systems Development Techniques: Strategic Planning to System Testing.
MLA-viite (9. p.)Collins, Garfield, et al. Structured Systems Development Techniques: Strategic Planning to System Testing.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.