New York : Macmillan Library Reference, 1997,
Buku Referensi
Crystal, David, 1941-
Cambridge University Press, 1994
Buku Referensi
Crystal, David, 1941-
Cambridge University Press, 1995
Buku Referensi
edited by Susan Bambrick
Cambridge University Press, 1994
Buku Referensi
edited by Brian Hook, Denis Twitchett
Cambridge University Press, 1991
Buku Referensi