@book{40971,
	author = {Douglas, Mary, and Criado, Carmen},
	title = {Símbolos naturales : exploraciones en cosmología},
	publisher = {Alianza Editorial,},
	year = {1978.},
	series = {Alianza Universidad ;},
	address = {Barcelona :},
	note = {GENERAL : Titulo original : Natural symbols : explorations in cosmology.}
}