Crystal, David. (1997). The Cambridge Encyclopedia of Language. Cambridge, Cambridge University Press.
Crystal, David. (2001). The Cambridge Encyclopedia of the English Language. Cambridge, Cambridge University Press.
Katzner, K. (1999). The Languages of the World. New York, Routledge.
McArthur, T. (1996). The Concise Companion to the English Language. Oxford, Oxford University Press.
7 External links
Mark Rosenfelder's Metaverse provides a useful listing of 4000 languages and dialects (grouped by their relationships), where the numbers one to ten in each language can be found
