Catéchisme à l'usage de toutes les églises de l'empire français (in French). Paris: Nyon-Sallant. 1806. pp. iii–iv, 58–59. Frank McLynn, Napoleon: A Biography (Great Britain: Jonathan Cape 1997; paper ed. New York: Arcade Pub. Co. 2001), pp. 352-353. Haussonville, II, pp. 255-295
Augustin Theiner; Paul De Geslin (1852). Histoire du pontificat de Clément XIV, d'après des documents inédits des archives secrètes du Vatican (in French). Paris: Didot. pp. 159–169. Ethelred Taunton, "Clement XIV and England," The Downside Review. Vol. 19. Downside Ireland: Downside Abbey. 1900. pp. 105–116.. Taunton prints a translation of the full text of Caprara's report to Clement XIV, drawn up on 12 July 1772, in which he notes inter alia the restiveness of the American colonies and the danger of their revolt.
Grand Duke Leopold of Tuscany knew of the transfer of Caprara to Vienna on 20 December 1784, and assured his brother Joseph II that he would be contented with the appointment. Joseph II; Leopold II (1872). Joseph II. und Leopold von Toscana: ihr Briefwechsel von 1781 bis 1790 (in French). Vol. Erster Band. Wien: W. Braumüller. pp. 251–253.
Cardinal Jean Siffrein Maury wrote to King Louis XVIII on 20 August 1801, "Le nouveau légat était tombé, depuis sa promotion au cardinalat, dans la disgrâce la plus complète du feu pape." Jean Siffrein Maury (1891). Charles Antoine Ricard (ed.). Correspondance diplomatique et mémoires inédits du Cardinal Maury: 1792-1817 (in French). Vol. Tome second. Lille: Desclée de Brouwer. p. 161.
Duerm, pp. 84-85, 176. Adolphe Thiers (1842). The History of the French Revolution. Vol. IV (second American ed.). Philadelphia: Carey and Hart. p. 108.
Aston, pp. 328-330. L.G. Wickham Legg, "The Concordats," in: The Cambridge Modern History. Vol. IX. Cambridge: CUP. 1906. pp. 185–188. GGKEY:T6BC5RT7F69.
Alexis François Artaud de Montor (1837). Histoire du Pape Pie VII (in French). Vol. Tome second (deuxieme ed.). Paris: Le Clere. p. 183.