Citazione APA

 Alexander, I. (2009).  Discovering requirements: How to specify products and services.  John Wiley and Sons, Ltd., Publication.

Stile di citazione Chicago

 Alexander, Ian.  Discovering Requirements: How to Specify Products and Services.  John Wiley and Sons, Ltd., Publication, 2009.

Citazione MLA

 Alexander, Ian.  Discovering Requirements: How to Specify Products and Services.  John Wiley and Sons, Ltd., Publication, 2009.

Attenzione: Queste citazioni potrebbero non essere precise al 100%.