^Ministry of Interior of Poland: Act of 6 January 2005 on national and ethnic minorities and on the regional languages
^ ئا"Czech language". www.britannica.com. Encyclopædia Britannica. Retrieved 6 January 2015.
^Jones, Daniel (2003) [1917], Peter Roach; James Hartmann; Jane Setter (eds.), English Pronouncing Dictionary, Cambridge: Cambridge University Press, ISBN978-3-12-539683-8
^Swan, Oscar E. (2002). A grammar of contemporary Polish (بە ئینگلیزی). Bloomington, Ind.: Slavica. p. 5. ISBN0-89357-296-9. OCLC50064627.
Dankovičová, Jana (1999). "Czech". Handbook of the International Phonetic Association (9th ed.). International Phonetic Association/Cambridge University Press. ISBN978-0-521-63751-0.
Komárek, Miroslav (2012). Dějiny českého jazyka (بە چیکی). Brno: Host. ISBN978-80-7294-591-7.
Kortmann, Bernd; van der Auwera, Johan (2011). The Languages and Linguistics of Europe: A Comprehensive Guide (World of Linguistics). Mouton De Gruyter. ISBN978-3-11-022025-4.
Koudela, Břetislav; et al. (1964). Vývoj českého jazyka a dialektologie (بە چیکی). Československé státní pedagogické nakladatelství.
Mathesius, Vilém (2013). A Functional Analysis of Present Day English on a General Linguistic Basis. De Gruyter. ISBN978-90-279-3077-4.
Maxwell, Alexander (2009). Choosing Slovakia: Slavic Hungary, the Czechoslovak Language and Accidental Nationalism. Tauris Academic Studies. ISBN978-1-84885-074-3.
Wilson, James (2009). Moravians in Prague: A Sociolinguistic Study of Dialect Contact in the Czech. Peter Lang International Academic Publishers. ISBN978-3-631-58694-5.