Gilb, T., & Brodie, L. (2005). Competitive engineering: A handbook for systems engineering, requirements engineering, and software engineering using planguage. Elsevier. https://doi.org/10.1016/B978-0-7506-6507-0.X5000-4
Lua i Stíl Chicago (17ú heag.)Gilb, Tom, agus Lindsey Brodie. Competitive Engineering: A Handbook for Systems Engineering, Requirements Engineering, and Software Engineering Using Planguage. United Kingdom: Elsevier, 2005. https://doi.org/10.1016/B978-0-7506-6507-0.X5000-4.
Lua MLA (9ú heag.)Gilb, Tom, agus Lindsey Brodie. Competitive Engineering: A Handbook for Systems Engineering, Requirements Engineering, and Software Engineering Using Planguage. Elsevier, 2005. https://doi.org/10.1016/B978-0-7506-6507-0.X5000-4.
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