Alexander, I., & Beus-Dukic, L. (2009). Discovering requirements: How to specify products and services. Wiley.
Citazione stile Chigago Style (17a edizione)Alexander, Ian, e Ljerka Beus-Dukic. Discovering Requirements: How to Specify Products and Services. Chichester, West Sussex, England: Wiley, 2009.
Citatione MLA (9a ed.)Alexander, Ian, e Ljerka Beus-Dukic. Discovering Requirements: How to Specify Products and Services. Wiley, 2009.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.