Languages spoken by more than 10 million people [online]. Encarta Encyclopedia, 2007, [cit. 2007-03-03]. Dostupné online. Archivované 2007-03-04 z originálu.
web.archive.org
Languages spoken by more than 10 million people [online]. Encarta Encyclopedia, 2007, [cit. 2007-03-03]. Dostupné online. Archivované 2007-03-04 z originálu.