Fisher, Roger Getting to yes : negotiating agreement without giving in / Roger Fisher and William Ury - 2nd ed. - New York : Penguin Books, c1991. - xix, 200 p. : 20 cm. ISBN: 0140157352 LCCN: Subjects--Topical Terms: Negotiation LC Class. No.: BF637 / .N4F57 1991 Dewey Class. No.: 158.5 / F535g