negotiating agreement without giving in Fisher, Roger Patton, Bruce Ury, William text xx New York Penguin Books 1991 9999 2nd ed. monographic und eng xix, 200 p. ; 20 cm. edited by Roger Fisher, William Ury, Bruce Patton Conflict Resolution & Mediation Negotiation BF637.N4 .F57 1991  0140157352 9780140157352 201220