edited by Michael Allaby
Oxford University Press, 1994
Buku Referensi
Warrack, John, author
Oxford University Press, 1996
Buku Referensi
Kennedy, Michael, author
Oxford University Press, 1996
Buku Referensi
edited by Catherine Soanes and Angus Stevenson
Oxford University Press, 2006
Buku Referensi
Fowler, H. W. (Henry Watson), 1858-1933, author
At The Clarendon Press, 1954
Buku Teks