| ACS |
Archivio Centrale dello Stato, Rome. |
| Archivio Mondadori |
Archivio della Fondazione Arnaldo & Alberto Mondadori, Milan. |
| DBFP |
Documents on British Foreign Policy 1919-1939. London: Her Majesty’s Printing Office, 1947-86. |
| DDF |
Documents diplomatiques français 1932-1939. Paris: Imprimerie Nationale, 1963–86. |
| DDI |
I documenti diplomatici italiani. Seventh & Eighth series. Rome: Istituto poligrafico e zecca, 1952-2006. |
| DGFP |
Documents on German Foreign Policy 1918-1945. Series C & D. Washington: Government Printing Office, 1949-1983. |
| LoC |
Library of Congress, Washington, DC. |
| MART |
Museo d’Arte Moderna e Contemporanea di Trento e Rovereto. |
| MCP |
Ministero della Cultura Popolare. |
| MI-DPP |
Ministero del Interno, Divisione Polizia Politica. |
| NARA |
National Archives and Records Administration, College Park, MD. |
| NAUK |
National Archives of the United Kingdom, Kew Gardens, London. |
| OO |
Opera omnia di Benito Mussolini. Eduardo and Duilio Susmel, eds. 37 vols. Florence: La Fenice, 1951-62. |
| OOA |
Opera omnia di Benito Mussolini, Appendici. Eduardo and Duilio Susmel, eds. 7 vols. Rome: G. Volpe, 1978-81. |
| PSI |
Partito Socialista Italiano. |
| RDS |
Records of the Department of State. |
| RG |
Record Group |
| SHAT |
Service Historique de l’Armée de Terre, Vincennes. |
| USAMHI |
United States Army Military History Institute, Carlisle Barracks, PA. |