- AAAS
Record Group XXI: Academy Projects and Programs. Institute for the Unity of Science (1947–1959). Archives, American Academy of Arts and Sciences, Cambridge, Massachusetts.
- ASP HR
Hans Reichenbach Papers, 1884–1972, ASP.1973.01, Archives of Scientific Philosophy, Archives & Special Collections, University of Pittsburgh Library System.
- ASP RC
Archives of Scientific Philosophy, Rudolf Carnap Papers, 1905–1970, ASP.1974.01, Archives & Special Collections, University of Pittsburgh Library.
- FW-SPSL
Friedrich Waismann file, Archive of the Society for the Protection of Science and Learning, Bodleian Libraries, Oxford (CMD ID 12544).
- HKP1
Papers of Horace Meyer Kallen, RG 317; Box 50, Folder 923, YIVO Institute for Jewish Research.
- HKP2
Papers of Horace Meyer Kallen, MS-1, Box 22, Folder 21, ‘Morris, Charles. 1948–1973’, Jacob Rader Marcus Center of the American Jewish Archives.
- HO
Home Office Records, The National Archives, Kew, London.
- IC
Otto and Marie Neurath Isotype Collection, Department of Typography & Graphic Communication, University of Reading, United Kingdom.
- INF
Ministry of Information Records, The National Archives, Kew, London.
- MSN
Moritz Schlick Nachlass, Wiener Kreis Archiv, Rijksarchief in Noord-Holland, Haarlem, the Netherlands.
- ON-SPSL
MS. S.P.S.L. 531/1-4. ‘T. Neugebauer – O. Neurath’. Bodleian Libraries, Archive of the Society for the Protection of Science and Learning (CMD ID 12544).
- ONN
Otto Neurath Nachlass, Wiener Kreis Archiv, Rijksarchief in Noord-Holland, Haarlem, the Netherlands.
- ÖNB
Otto & Marie Neurath Nachlass, Österreichische Nationalbibliothek, Vienna.
- PF
Else Pappenheim and Stephen Frishauf Archive (private).
- RF
Rockefeller Foundation Records, projects, SG 1.1, Series 100, International – Series 257 Virgin Islands, USA (FA386a), International – General (No program), Subseries 100.Gen.
- RKA
Routledge & Kegan Paul Archive, University of Reading, United Kingdom.
- UCLA
Rudolf Carnap papers, Collection 1029, UCLA Library Special Collections, Charles E. Young Research Library, Los Angeles.
Otto Neurath’s collected writings are published in German in the eight volumes of his Gesammelte Schriften, edited by Rudolf Haller (†) and Friedrich Stadler (Vienna: LIT Verlag, 2021–2). In bibliographical references, these are referred to as ‘GS’ with the respective volume no (e.g. GS5).
Most quotations from German texts by Neurath are taken from the published English translations:
M. Neurath and R. S. Cohen (eds.) (1973), Otto Neurath: Empiricism and Sociology. Dordrecht: D. Reidel.
R. S. Cohen and M. Neurath (eds.) (1983), Otto Neurath: Philosophical Papers 1913–1946. Dordrecht: D. Reidel.
Th. Uebel and R. S. Cohen (eds.) (2004), Otto Neurath: Economic Writings: Selections 1904–1945. Dordrecht: Kluwer.
The correspondence between Neurath and Rudolf Carnap during Neurath’s years in Britain are cited from:
J. Cat and A. T. Tuboly (eds.) (2019), Neurath Reconsidered: New Sources and Perspectives. Cham: Springer.