Jaceb, E. F.
Clarendon Press, 1961
Buku Teks
Plumb, J.H. (John Harold), 1911-
Penguin Books, 1963
Buku Teks
Thomas, David
Penguin Books, 1963
Buku Teks
Hewison, Robert, 1943-
Methuen, 1995
Buku Teks
Clark, G. Kitson
Methuen & Co., Ltd., 1962
Buku Teks