Andrews, Richard
Cambridge University Press, 2009
eBooks
Burckhardt, Jacob
Harper Torchbooks, 1968
Buku Teks
Burke, Peter
Princeton University Press, 1986
Buku Teks
Durant, Will
Simon and Schuster, 1953
Buku Teks
Andrews, Richard B.
The Free Press, 1971
Buku Teks