Documenti diplomatici italiani 1952–2006. Series 8 (1935–39), vols. 11–13; series 9 (1939–43), vols. 1, 3, 4, 6, 8–10. Rome: Libreria dello Stato.
Documents diplomatiques français. Series 2 (1936–39). 1970. Vol. 6. Paris: Imprimerie Nationale.
Documents of German Foreign Policy 1918–1945. 1953–62. Series D (1937–45), vols. 5–9, 11–13. Washington, D.C.: U.S. Government Printing Office.
Dole, Bob. 2005. One Soldier's Story. New York: HarperCollins.
Doyle, Charles H. 1950. A Day with the Pope. Garden City, N.Y.: Doubleday.
Duquesne, Jacques. 1966. Les Catholiques français sous l'occupation. Paris: Éditions Grasset.
Fattorini, Emma. 2007. Pio XI, Hitler e Mussolini, la solitudine di un papa. Turin: Einaudi.
–. 2011. Hitler, Mussolini and the Vatican: Pope Pius XI and the Speech That Was Never Made. Translated by Carl Ipsen. Boston: Polity.
Fenoglio, Luca. 2020. "Fascist Policy Toward Jews in South-Eastern France, 1942–1943." In The "Jewish Question" in the Territories Occupied by Italians 1939–1943. Edited by Giovanni Orsina and Andrea Ungari, pp. 117–133. Rome: Viella.
Ferrari, Ada. 1982. "Ildefonso Schuster." In Dizionario storico del movimento cattolico in Italia. Edtied by Francesco Traniello and Giorgio Campanini, pp. 2:586–591. Milan: Marietti.
Festorazzi, Roberto. 2012. Claretta Petacci. Argelato: Minerva Edizioni.
Flynn, George. 1972. "Franklin Roosevelt and the Vatican: The Myron Taylor Appointment." Catholic Historical Review 58 (2): 171–194.
Foa, Anna, and Lucetta Scaraffia. 2021. Anime nere. Due donne e due destini nella Roma nazista. Milan: Marsilio.
Focardi, Filippo. 2013. Il cattivo tedesco e il bravo italiano. Rome: Laterza.
Fogarty, Gerald P. 1996. "Pius XI and the Episcopate in the United States." Publications de l'École Française de Rome 223 (1): 549–564.
–. 2003. "Roosevelt and the American Catholic Hierarchy." In Franklin D. Roosevelt, the Vatican, and the Roman Catholic Church in America, 1933–1945. Edited by David B. Woolner and Richard G. Kurial, pp. 21–43. New York: Palgrave Macmillan.
Foreign Relations of the United States. 1956–65. 1939, vol. 2; 1940, vol. 2; 1942, vol. 3; 1943, vols. 2–3; 1944, vol. 4. Washington, D.C.: U.S. Government Printing Office.
Fouilloux, Etienne. 2011. Eugène, cardinal Tisserant (1884–1972). Une biographie. Paris: Desclée de Brouwer.
François-Poncet, André. 1961. Au palais Farnèse. Souvenir d'une ambassade à Rome, 1939–1940. Paris: Fayard.
Franzinelli, Mimmo. 2000. "Postfazione." In Il manganello e l'aspersorio, by Ernesto Rossi, pp. 333–354. Milan: Kaos.
–. 2012. Il prigioniero di Salò. Mussolini e la tragedia del 1943–1945. Milan: Mondadori.
Friedländer, Saul. 1966. Pius XII and the Third Reich: A Documentation. New York: Knopf.
Gagliani, Dianella. 2015. "Petacci, Clara." Dizionario biografico degli italiani, vol. 82, https://www.treccani.it/enciclopedia/ricerca/clara-petacci/.
Gallagher, Charles R. 2008. Vatican Secret Diplomacy: Joseph P. Hurley and Pope Pius XII. New Haven, Conn.: Yale University Press.
–. 2021. Nazis of Copley Square. Cambridge, Mass.: Harvard University Press.
Gannon, Robert I. 1962. The Cardinal Spellman Story. Garden City, N.Y.: Doubleday.
Gedeon, Dimitrios. 1997. An Abridged History of the Greek-Italian and Greek-German War, 1940–1941. Athens: Hellenic Army General Staff, Army History Directorate.
Gentile, Emilio. 2018. 25 luglio 1943. Rome: Laterza.
Gioannini, Marco. 2012. "Bombardare l'Italia. Le strategie alleate e le vittime civili." In I bombardamenti aerei sull'Italia. Edited by Nicola Labanca, pp. 79–98. Bologna: Il Mulino.