@book{121813,
	author = {Grobstein, Clifford},
	title = {De la casualidad a la intención},
	publisher = {Alhambra},
	year = {1986.},
	series = {Exedra, no.},
	address = {Madrid},
	note = {Translation of : From chance to purpose : an appraisal of external human fertilization.}
}