- Radio Free Europe/Radio Liberty Research Institute (RFE/RL Research Institute)2,538
- Columbia University School of International Affairs358
- Héderváry, Claire de183
- Pallai, Péter4
- Balogh, Eva S.2
- Geréb, Anna2
- Hanák, Péter2
- Nóvé, Béla2
- Péter Forgács2
- Rákosi, Mátyás2
- Bortstieber, Gertrud1
- British Broadcasting Corporation, Written Archive Centre1
- Csákó, Mihály1
- Cséry, László1
- Darvas, József1
- Fehér, Lajos1
- Great Britain, Foreign and Commonwealth Office1
- Hegedüs, András1
- Historical Archives of the Hungarian State Security1
- Hungarian Ministry of the Interior1