How can introducing a third party aid in resolving conflict?

What are the advantages of mediation?
How can introducing a third party aid in resolving conflict?
The hierarchy of leaders and followers has changed over time. Discuss how the roll of the nurse manager has changed and how it has affected daily practice of the nurse.
I need an APA reference on each part…total of two, The first two questions are one answer and the role of the nurse manager is the next