@book{4149,
	author = {Kammen, Michael G. and Barrios de López, Norma},
	title = {U.S.A. país de contradicciones :},
	publisher = {EDISAR (Editora Distribuidora Argentina),},
	year = {1975.},
	address = {Buenos Aires :},
	note = {"First publishd by Alfred A. Knopf, Inc., 1972"--T.p. verso.}
}