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
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
Varga, Eugen, 1879-1964
Twentieth century capitalism
Foreign Languages Publishing House, 1961
 Buku Teks