Ratzan, L. (2004). Understanding information systems: What they do and why we need them. American Library Association.
Lua i Stíl Chicago (17ú heag.)Ratzan, Lee. Understanding Information Systems: What They Do and Why We Need Them. Chicago: American Library Association, 2004.
Lua MLA (9ú heag.)Ratzan, Lee. Understanding Information Systems: What They Do and Why We Need Them. American Library Association, 2004.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.