Virtù e vizi / Philippa Foot. - Foot, Philippa. (OLS)http://pul/name/53194 (Il Mulino, 2008)

Some aspects of the international law of the air / by R.Y. Jennings. - Jennings, Robert Yewdall, 1913- (OLS)http://pul/name/60144 (s. n.], 1949)
Bibliografia in nota.