Crystal, David, 1941-, author
Cambridge University Press, 1994
Buku Referensi
Crystal, David, 1941-, author
Cambridge University Press, 1995
Buku Referensi
editor in chief Paul Procter
Cambridge University Press, 1995
Buku Referensi
Bakich, Michael E., author
Cambridge University Press, 1999
Buku Referensi
Lutz, William D., author
Cambridge University Press, 1994
Buku Referensi