Knight, B., & Hammel, B. (2013). The power of negative thinking: An unconventional approach to achieving positive results. New Harvest.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रKnight, Bobby, और Bob Hammel. The Power of Negative Thinking: An Unconventional Approach to Achieving Positive Results. Boston: New Harvest, 2013.
एमएलए (8वां संस्करण) प्रशस्ति पत्रKnight, Bobby, और Bob Hammel. The Power of Negative Thinking: An Unconventional Approach to Achieving Positive Results. New Harvest, 2013.
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