1. JRC-Acquis (2014).
https://ec.europa.eu/jrc/en/language-technologies/jrc-acquis
2. Morfeusz SGJP (2014).
http://sgjp.pl/morfeusz/
3. Mozilla dictionaries (2014).
https://wiki.mozilla.org/L10n:Dictionaries
4. OpenSubtitles2011 (2014).
http://datahub.io/dataset/opus/resource/e5a441a7-73d5-4f8c-a4b5-4bab42a739f2
5. Tatoeba (2014).
http://tatoeba.org/pol/downloads