Getting to yes : negotiating agreement without giving in / by Roger Fisher and William Ury, with Bruce Patton, editor. - Fisher, Roger, 1922-2012, autore. (OLS)http://pul/name/114406; Patton, Bruce, curatore. (OLS)http://pul/name/114407; Ury, William, 1953-, autore. (OLS)http://pul/name/113776