APA-viite (7. p.)

Alexander, I., & Beus-Dukic, L. (2009). Discovering requirements: How to specify products and services. Wiley.

Chicago-viite (17. p.)

Alexander, Ian, ja Ljerka Beus-Dukic. Discovering Requirements: How to Specify Products and Services. Chichester, West Sussex, England: Wiley, 2009.

MLA-viite (9. p.)

Alexander, Ian, ja Ljerka Beus-Dukic. Discovering Requirements: How to Specify Products and Services. Wiley, 2009.