Posner, R. A. (2001). Frontiers of legal theory. Harvard University Press.
Dyfyniad Arddull ChicagoPosner, Richard A. Frontiers of Legal Theory. Cambridge, Mass: Harvard University Press, 2001.
Dyfyniad MLAPosner, Richard A. Frontiers of Legal Theory. Harvard University Press, 2001.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.