MacIntyre, Alasdair
A short history of ethics: a history of moral philosophy from the Homeric Age to the Twentieth Century
Rontledge , 1998
 Buku Teks
Gorbachev, Mikhail
Moral lessons of twentieth century : Gorbachev and Ikeda on Buddhism and communism / Mikhail Gorbachev and Daisaku Ikeda
I.B. Tauris, 2005
 Buku Teks
Woodham, Jonatham M.
Twentieth-Century design
Oxford University Press, 1997
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Revolutions of the late twentieth century
edited by Jack A. Goldstone, Ted Robert Gurr, Farrokh Moshiri
Westview Press, 1991
 Buku Teks
Black, C.E.
Twentieth Century Europa: a history
Alfred A. Knopf, 1961
 Buku Teks