APA (7th ed.) Zitazioa

Ayres, I. (2005). Optional law: The structure of legal entitlements. University of Chicago Press.

Chicago Style (17th ed.) Zitazioa

Ayres, Ian. Optional Law: The Structure of Legal Entitlements. Chicago: University of Chicago Press, 2005.

MLA (9th ed.) Zitazioa

Ayres, Ian. Optional Law: The Structure of Legal Entitlements. University of Chicago Press, 2005.