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Christopher Mosely, ed., 2007, Encyclopedia of the World's Endangered Languages
Hadumod Bussmann, 1996, Routledge Dictionary of Language and Linguistics
P.J Payton, "Cornish", in Brown & Ogilvie, eds., 2009, Concise Encyclopedia of Languages of the World
Bernard Comrie, ed, 2009, The World's Major Languages, 2nd edition
James Clackson, 2007, Indo-European Linguistics: An Introduction
Gareth King, 2003, Modern Welsh: A Comprehensive Grammar, 2nd edition
