Keylor, William R., 1944-
The twentieth-century world
Oxford University Press, 1996
 Buku Teks
Ewen, David
The world of twentieth-century music
Prentice Hall, 1968
 Buku Referensi
Keylor, William R., 1944-
The twentieth-century world : an international history
Oxford University Press, 1996
 Buku Teks
Black, C.E.
Twentieth Century Europa: a history
Alfred A. Knopf, 1961
 Buku Teks
Revolutions of the late twentieth century
edited by Jack A. Goldstone, Ted Robert Gurr, Farrokh Moshiri
Westview Press, 1991
 Buku Teks