Ratzan, L. (2004). Understanding information systems: What they do and why we need them. American Library Association.
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Dyfyniad Arddull Chicago
Ratzan, Lee. Understanding Information Systems: What They Do and Why We Need Them. Chicago: American Library Association, 2004.
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Dyfyniad MLA
Ratzan, Lee. Understanding Information Systems: What They Do and Why We Need Them. American Library Association, 2004.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.