1. 1. Archives of the Academy of Lincei [AAL], Private Archives, Tullio Levi-Civita Archive [TLCA].
2. 2. Archive of the family Silberstein-Ceccherini [ASC], Rome, Cahier de voyage of Libera Trevisani Levi-Civita, Travel in South America 1937, 6 fols.
3. 3. Bodleian Libraries, Oxford, Archive of the Society for the Protection of Science and Learning [ASPSL], Correspondence relating to individual scholars, Mathematics, Terracini, Professor Alessandro (1884-), File 1938-46, 285/5, fols. 340.
4. 4. Department of Philosophy of the State University of Milan, Archive of Giovanni Vailati [AGV].
5. 5. Fubini Family Collection [FFC], Boston, Laurie and David G. Fubini's private archive. Historical Archive of the University of Turin [HAUT].