APA-viite (7. p.)

Kotonya, G., & Sommerville, I. (1998). Requirements engineering: Processes and techniques. J. Wiley.

Chicago-viite (17. p.)

Kotonya, Gerald, ja Ian Sommerville. Requirements Engineering: Processes and Techniques. Chichester ; New York: J. Wiley, 1998.

MLA-viite (8. p.)

Kotonya, Gerald, ja Ian Sommerville. Requirements Engineering: Processes and Techniques. J. Wiley, 1998.