Janson, T. (2002). Speak: A short history of languages. Oxford University Press.
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Chicago-čujuhus (17. p.)
Janson, Tore. Speak: A Short History of Languages. Oxford ; New York: Oxford University Press, 2002.
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MLA-čujuhus (9. p.)
Janson, Tore. Speak: A Short History of Languages. Oxford University Press, 2002.
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