Stone Douglas, Heen, S., & Patton Bruce. (1999). Difficult conversations: How to discuss what matters most. Penguin Books.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रStone Douglas, Sheila Heen, और Patton Bruce. Difficult Conversations: How to Discuss What Matters Most. New York: Penguin Books, 1999.
एमएलए (9वां संस्करण) प्रशस्ति पत्रStone Douglas, et al. Difficult Conversations: How to Discuss What Matters Most. Penguin Books, 1999.
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