Stone, D., Heen, S., & Patton, B. (1999). Difficult conversations: How to discuss what matters most. Penguin Group.
Cita Chicago (17th ed.)Stone, Douglas, Sheila Heen, i Bruce Patton. Difficult Conversations: How to Discuss What Matters Most. New York: Penguin Group, 1999.
Cita MLA (9th ed.)Stone, Douglas, et al. Difficult Conversations: How to Discuss What Matters Most. Penguin Group, 1999.
Atenció: Aquestes cites poden no estar 100% correctes.