Young, R. R. (2001). Effective requirements practices. Addison-Wesley.
Cita Chicago (17th ed.)Young, Ralph R. Effective Requirements Practices. Boston, MA: Addison-Wesley, 2001.
Cita MLA (8th ed.)Young, Ralph R. Effective Requirements Practices. Addison-Wesley, 2001.
Atenció: Aquestes cites poden no estar 100% correctes.