Cita APA (7a ed.)

Stone Douglas, Heen, S., & Patton Bruce. (1999). Difficult conversations: How to discuss what matters most. Penguin Books.

Cita Chicago Style (17a ed.)

Stone Douglas, Sheila Heen, y Patton Bruce. Difficult Conversations: How to Discuss What Matters Most. New York: Penguin Books, 1999.

Cita MLA (9a ed.)

Stone Douglas, et al. Difficult Conversations: How to Discuss What Matters Most. Penguin Books, 1999.