Lua APA (7ú heag.)

Sommerville, I., & Sawyer, P. (1977). Requirements engineering: A good practice guide. Wiley.

Lua i Stíl Chicago (17ú heag.)

Sommerville, Ian, agus Pete Sawyer. Requirements Engineering: A Good Practice Guide. Chichester, Eng. ; New York ; New Delhi: Wiley, 1977.

Lua MLA (8ú heag.)

Sommerville, Ian, agus Pete Sawyer. Requirements Engineering: A Good Practice Guide. Wiley, 1977.

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