@book{62956,
	author = {Fisher, Roger and Ury, William},
	title = {Obtenga el si},
	publisher = {Companía Editorial Continental},
	year = {1985, 1984.},
	address = {Mexico},
	edition = {4 impresión.},
	note = {Reprint. Originally published: Boston : Houghton Mifflin, 1981.}
}