Cousin, J. A. J.; Condorcet, Jean-Antoine-Nicolas de Caritat, marquis de,; Mercier de Saint-Léger, Barthélemy,; Burndy Library Manuscripts Collection (Smithsonian Libraries)
Boguslawski, Palon Heinrich Ludwig von,; Eichstädt, Heinrich Karl Abraham,; Allgemeine Anzeiger oder National Zeitung, Gotha; Burndy Library Manuscripts Collection (Smithsonian Libraries)