Lester, R. K. (1998). The productive edge: How U.S. industries are pointing the way to a new era of economic growth. W.W. Norton.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रLester, Richard K. The Productive Edge: How U.S. Industries Are Pointing the Way to a New Era of Economic Growth. New York: W.W. Norton, 1998.
एमएलए (9वां संस्करण) प्रशस्ति पत्रLester, Richard K. The Productive Edge: How U.S. Industries Are Pointing the Way to a New Era of Economic Growth. W.W. Norton, 1998.
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