@book{4320,
	author = {Humboldt, Alexander von,  and Biblioteca Ayacucho},
	title = {Cartas americanas },
	publisher = {Fundación Biblioteca Ayacucho,},
	year = {1989.},
	series = {Biblioteca Ayacucho},
	address = {Caracas :},
	edition = {2a ed.}
}