Ratzan, L. (2004). Understanding information systems: What they do and why we need them. American Library Association.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रRatzan, Lee. Understanding Information Systems: What They Do and Why We Need Them. Chicago: American Library Association, 2004.
एमएलए (9वां संस्करण) प्रशस्ति पत्रRatzan, Lee. Understanding Information Systems: What They Do and Why We Need Them. American Library Association, 2004.
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