Cita APA (7th ed.)

Posner, R. A. (2001). Frontiers of legal theory. Harvard University Press.

Cita Chicago (17th ed.)

Posner, Richard A. Frontiers of Legal Theory. Cambridge, Mass: Harvard University Press, 2001.

Cita MLA (9th ed.)

Posner, Richard A. Frontiers of Legal Theory. Harvard University Press, 2001.