Crystal, David, 1941-, author
Cambridge University Press, 1991
Buku Referensi
Crystal, David, 1941-, author
Cambridge University Press, 1997
Buku Referensi
Hoji, Hajime, author
United Kingdom Cambridge University Press, 2015
Buku Teks
Crystal, David, 1941-, author
Cambridge University Press, 1994
Buku Referensi
edited by Valerie Kinsella
Cambridge Uniiversity Press , 1979
Buku Teks