edited by Susan Bambrick
Cambridge University Press, 1994
Buku Referensi
Andrew, Nancy Learmonth, compiled
Frederick Warne & Co , 1973
Buku Referensi
Crystal, David, 1941-, author
Cambridge University Press, 1991
Buku Referensi
New York Cambridge University Press 1991
Buku Referensi
Crystal, David, 1941-, author
Cambridge University Press, 1997
Buku Referensi