Brzezinski, Zbigniev K.
The Grand failure : the birth and death of communism in the twentieth century
Chartes Scribner's, 1989
 Buku Teks SO
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 SO
Woodham, Jonatham M.
Twentieth-Century design
Oxford University Press, 1997
 Buku Teks SO
Chant, Christopher
Twentieth century war machines
London: Chancellor Press, 1999,
 Buku Referensi
Revolutions of the late twentieth century
edited by Jack A. Goldstone, Ted Robert Gurr, Farrokh Moshiri
Westview Press, 1991
 Buku Teks SO