Washington Operations Research Council & Chartrand, R. L. e. (1971). Hope for the cities; a systems approach to human needs. Spartan Books.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रWashington Operations Research Council और Robert Lee ed Chartrand. Hope for the Cities; a Systems Approach to Human Needs. New York: Spartan Books, 1971.
एमएलए (9वां संस्करण) प्रशस्ति पत्रWashington Operations Research Council और Robert Lee ed Chartrand. Hope for the Cities; a Systems Approach to Human Needs. Spartan Books, 1971.
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