Britain in the twentieth century : a documentary reader; Vol. I 1900-1939
edited by Lawrence Butler and Harriet Jones
Heinemann , 1994
 Buku Referensi
Woodham, Jonatham M.
Twentieth-Century design
Oxford University Press, 1997
 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