- Bortstieber, Gertrud5
- Samizdat Archives3
- Geréb, Anna2
- Arnshtam, Leo1
- Chiaureli, Mikhail1
- Communist International (Comintern)1
- Hanák, Péter1
- Hegedüs, András1
- Karmen, Roman1
- Open Society Archives at Central European University1
- Pudovkin, Vsevolod1
- Radio Free Europe/Radio Liberty, Inc - Research Institute1
- Romanian Unit1
- Samizdat Archives of Radio Free Europe1
- Zavalishin, Viacheslav1