@book {519, title = {Getting to Yes: Negotiating Agreement Without Giving In}, year = {2011}, publisher = {Penguin Publishing Group}, organization = {Penguin Publishing Group}, isbn = {9781101539545}, url = {http://www.penguinrandomhouse.com/books/324551/getting-to-yes-by-roger-fisher/9780143118756/}, author = {Fisher, R. and Ury, W.L. and Patton, B.} }