1. Scientists for Sakharov, Orlov and Shcharansky records, Hoover Institution Archives, Stanford University.
2. The Committee of Concerned Scientists records 1970–2006, Columbia University Rare Book and Manuscript Library.
3. Human Rights Watch records: Record Group 1: Helsinki Watch 1952–2003, Columbia University Rare Book and Manuscript Library.
4. Siegelman, Philip. 2017. To the author, July 23, 2017.
5. Caroli, Christiane. 2022. To the author, July 9, 2022.