Seth, Michael J
Buku Teks
Seth, Michael J., 1948-, author
Rowman, 2006
Buku Teks
Gooch, G.P., author
Beacon Press, 1968
Buku Teks
Trevelyan, George Macaulay, 1876-1962, author
Penguin Books, 1979
Buku Teks
Treitschke, Heinrich von
The University of Chicago Press, 1975
Buku Teks