Check out Scrum Handbook: Servant Leadership And Scrum Mastering by The 3Back Team. Here is an excerpt:
Scrum Mastering is a servant-leadership role. That’s a given. The phrase servant leader, first coined by Robert K. Greenleaf in his groundbreaking essay, The Servant as Leader, defined the role as focusing “primarily on the growth and well-being of people and the communities to which they…
The full article is available here.