==External links==* Article by Gianni Barbacetto* (mentions P2 as part of its storyline)* Philip Willan, personal website of journalist and author with information on Roberto Calvi, Banco Ambrosiano, Licio Gelli, Propaganda Due.
The Mafia: The Long Reach of the International Sicilian Mafia, ISBN 0-586-21234-5* Article by Gianni Barbacetto* (mentions P2 as part of its storyline)* Philip Willan, personal website of journalist and author with information on Roberto Calvi, Banco Ambrosiano, Licio Gelli, Propaganda Due.