Brzezinski, Zbigniev K.
The Grand failure : the birth and death of communism in the twentieth century
Chartes Scribner's, 1989
 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
Varga, Eugen, 1879-1964
Twentieth century capitalism
Foreign Languages Publishing House, 1961
 Buku Teks
Kohn, Hans
African nationalism in the twentieth century
D. Van Nostrand, 1965
 Buku Teks