APA (7e ed.) Bronvermelding

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

Chicago (17e ed.) Bronvermelding

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

MLA (8e ed.) Bronvermelding

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