APA-referens (7:e uppl.)

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

Chicago-referens (17:e uppl.)

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

MLA-referens (8:e uppl.)

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