Gerzon, M., Gallo, A., Knight, R., Schwartz, T., Weeks, H., & Gerzon, M. Dealing with difficult people: Emotional Intelligence. Harvard Business Review Press.

Gerzon, Mark, Amy Gallo, Rebecca Knight, Tony Schwartz, Holly Weeks, và Mark  Gerzon. Dealing With Difficult People: Emotional Intelligence. Harvard Business Review Press.

Gerzon, Mark, et al. Dealing With Difficult People: Emotional Intelligence. Harvard Business Review Press.