Moncrieff, A.R. Hope, author
Gramercy Books, 1995
Buku Referensi
Cotterell, Arthur, author
Lorenz Books, 2013
Buku Teks
Mackenzie, Donald A., author
Gramercy Books, 1994
Buku Referensi
Whittock, Martyn, author
Running Press, 2013
Buku Teks
Graves, Robert, author
Penguin Books, 1960
Buku Teks