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linguasphere.info
David Dalby, 1999/2000, The Linguasphere register of the world's languages and speech communities. Observatoire Linguistique, Linguasphere Press. Volume 2. Oxford.[liên kết hỏng][1][2]Lưu trữ 2014-08-27 tại Wayback Machine
David Dalby, 1999/2000, The Linguasphere register of the world's languages and speech communities. Observatoire Linguistique, Linguasphere Press. Volume 2. Oxford.[liên kết hỏng][1][2]Lưu trữ 2014-08-27 tại Wayback Machine