- Erenburg, Ilʹia1
- Frojimovics, Kinga1
- Gafencu, Grigore1
- Garner, Frank Harold1
- Great Britain, Foreign and Commonwealth Office1
- Hegedüs, András1
- Janta, Aleksander1
- Karski, Jan1
- Kemény, István1
- Kieser, Georges1
- Lavrenëv, Boris1
- Magos-Gimes, Judit1
- Magyar Film Intézet1
- Miklós Hollós1
- Murray, Michael1
- National Committee of Americans of Polish Descent1
- Open Society Archives at Central European University1
- Pol, Wincenty1
- Pyriev, Ivan1
- Radio Free Europe/Radio Liberty, Inc - Research Institute1