@book{2525,
	author = {Serres, Michel, and Larraceleta, Umbelina},
	title = {El contrato natural /},
	publisher = {Pre-Textos,},
	year = {2004.},
	series = {(Pre-textos. Ensayo ;},
	address = {Valencia :},
	edition = {2.ª edición}
}