- Bortstieber, Gertrud4
- Samizdat Archives3
- Nóvé, Béla2
- Pallai, Péter2
- Balogh, Eva S.1
- Burnham, James1
- Communist International (Comintern)1
- Croce, Benedetto1
- Ferris, Alexander James1
- Gordon, Manya1
- Great Britain, Foreign and Commonwealth Office1
- Hegedüs, András1
- Hoden, Marcel1
- Magos-Gimes, Judit1
- Miklós Hollós1
- Open Society Archives at Central European University1
- Polish research centre, London1
- Privát Fotó és Film Alapítvány1
- Péter Forgács1
- Radio Free Europe/Radio Liberty, Inc - Research Institute1