@book{12121,
	author = {Ubelacker, Erich. and Blendinger, Johannes, },
	title = {Energía / },
	publisher = {Panamericana Editorial, },
	year = {2012.},
	series = {Cómo y por qué},
	address = {Bogotá : },
	edition = {Editor César A. Cardozo Tovar.},
	note = {Incluye índice.}
}