@book{4994,
	author = {Asimov, Isaac,},
	title = {Los Estados Unidos de 1816 hasta la guerra civil  /},
	publisher = {Alianza Editorial,},
	year = {1983},
	address = {Madrid :},
	note = {Título original: Our federal union- the United States from 1816 to 1865, traductor: Néstor A. Miguez}
}