Cotterell, Arthur
Lorenz Books, 2013
Buku Teks
Mackenzie, Donald A.
Gramercy Books, 1994
Buku Referensi
Whittock, Martyn
Running Press, 2013
Buku Teks
Graves, Robert, 1895-1985
Penguin Books, 1960
Buku Teks
Cotterell, John
Lorenz Books, 2000
Buku Referensi