Darcy, Martin Cyril
Faber and Faber , 1959
Buku Teks
Hook, Sidney, author
Beacon Press, 1943
Buku Teks
Lovejoy, Arthur O.
Harper Torchbooks, 1960
Buku Teks
Southgate, Beverley
Routledge , 1996
Buku Teks
Toynbee, Arnold J., author
Oxford University Press, 1948
Buku Teks