Crystal, David, 1941-
The Cambridge encyclopedia of language
Cambridge University Press, 1991
 Buku Referensi
Crystal, David, 1941-
The Cambridge encyclopedia of language
Cambridge University Press, 1997
 Buku Referensi
Crystal, David, 1941-
The Cambridge encyclopedia of the English language
Cambridge University Press, 1995
 Buku Referensi
Crystal, David, 1941-
Ensiklopedi Bahasa = The Cambridge encyclopedia of language
Nuansa Cendekia, 2015
 Buku Referensi
Cambridge encyclopedia of China
New York Cambridge University Press 1991
 Buku Referensi