Pearson, Frederic S.
International relations : the global condition in the late twentieth century
McGraw-Hill, 1992
 Buku Teks
Revolutions of the late twentieth century
edited by Jack A. Goldstone, Ted Robert Gurr, Farrokh Moshiri
Westview Press, 1991
 Buku Teks
Braun, Hans-Joachim
The German economy in the twentieth century
Routledge, 1990
 Buku Teks
Keylor, William R., 1944-
The twentieth-century world
Oxford University Press, 1996
 Buku Teks
Findley, Carter V.
Twentieth-century world
Wadsworth and Cengage Learning, 2011
 Buku Teks