Minahan, James (2002) Encyclopedia of the Stateless Nations: S-Z (Volume 4 of Encyclopedia of the Stateless Nations: Ethnic and National Groups Around the World) Greenwood Publishing Group, Westport, Connecticut, page 1765, ISBN 978-0-313-32384-3
Price, Glanville (editor) (2000) Encyclopedia of the languages of Europe Wiley-Blackwell, Oxford, England, page 21, ISBN 978-0-631-22039-8
Shaffer, Brenda (2002) Borders and brethren: Iran and the challenge of Azarbaijani identity, MIT Press, Cambridge, Massachusetts, page 1, ISBN 978-0-262-69277-9
