Resources about nonviolent communication
Marshall Rosenberg: Nonviolent Communication. PuddleDancer Press, 2003.
The Centre for Nonviolent Communication. http://www.cnvc.org/
Col. of authors: How to practise non-violent communication. http://www.wikihow.com/Practice-Nonviolent-Communication (25.2.2013)
A. Kjerulf: 5 essential steps to resolve a conflict at work. http://positivesharing.com/ (10.11.2012)