@book{6038,
	author = {Nebel, Bernard J. and Wright, Richard T., autor.},
	title = {Ciencias ambientales :},
	publisher = {Prentice Hall Hispanoamericana, },
	year = {1999},
	address = {México, D. F. :},
	edition = {Sexta edición},
	note = {Incluye índice.}
}