Crystal, David, 1941-, author
Language death
Cambridge University Press, 2004
 Buku Teks
Crystal, David, 1941-, author
Language death
Cambridge University Press, 2005
 Buku Teks
Language death / David Crystal
Cambridge University Press, 2004
 eBooks
Dalby, Andrew
Language in danger
A. Lane, 2002
 Buku Teks
Bloomfield, Leonard, author
Language
Holt, Rinehart and Winston, 1961
 Buku Teks
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