Katzner, Kenneth [1977]. The Languages of the World. 3a edició. Routledge, 2002, pg 153. ISBN 0-415-25004-8 [Consulta: 11 setembre 2008]. «...language of Turkey, spoken by about 60 million...also some 750,000 speakers in Bulgaria, 150,000 in Cyprus, and 100,000 in Greece…in Germany, numbering over 2 million people...»[Enllaç no actiu]