APA (7th ed.) Citation

Ratzan. (2009). Understanding information systems: What they do and why we need them. Indiana Publishing.

Chicago Style (17th ed.) Citation

Ratzan. Understanding Information Systems: What They Do and Why We Need Them. New Delhi: Indiana Publishing, 2009.

MLA (8th ed.) Citation

Ratzan. Understanding Information Systems: What They Do and Why We Need Them. Indiana Publishing, 2009.