- Radio Free Europe/Radio Liberty Research Institute (RFE/RL Research Institute)10,739
- Héderváry, Claire de8
- Dyulgerov, Georgi5
- Traikova, Eldora5
- Şimşir, Bilâl N.3
- Castaignède, Frédéric2
- Geréb, Anna2
- Kostov, Vladimir2
- Markov, Georgi2
- Andonov, Metodi1
- Atanassova, Evgenia1
- Balabanov, Gueorgui1
- Balikci, Asen1
- Bonchev, TSvetan1
- Bonev, Kostadin1
- Bulgarian Unit1
- Bíró, András1
- Chary, Frederick B.1
- Cohen, Francis1
- Constant, Stephen1