Williams, B., & Hummelbrunner, R. (2009). Systems concepts in action: A practitioner's toolkit. Stanford Business Books.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रWilliams, Bob, और Richard Hummelbrunner. Systems Concepts in Action: A Practitioner's Toolkit. Stanford, Calif.: Stanford Business Books, 2009.
एमएलए (9वां संस्करण) प्रशस्ति पत्रWilliams, Bob, और Richard Hummelbrunner. Systems Concepts in Action: A Practitioner's Toolkit. Stanford Business Books, 2009.
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