Cita APA (7a ed.)

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

Cita Chicago Style (17a ed.)

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

Cita MLA (8a ed.)

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