Abell, D. F. (1993). Managing with dual strategies: Mastering the present preempting the future. Free Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रAbell, Derek F. Managing with Dual Strategies: Mastering the Present Preempting the Future. Free Press, 1993.
एमएलए (8वां संस्करण) प्रशस्ति पत्रAbell, Derek F. Managing with Dual Strategies: Mastering the Present Preempting the Future. Free Press, 1993.
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