Richards, Michael D
Twentieth-century Europe : a brief history, 1900 to the present
John Wiley &​ Sons, 2014
 Buku Teks
Twentieth century physics; Volume II
edited by Laurie M. Brown, Abraham Pais and,Sir Brian Pippard
Institute of Physics Publishing ; American Institute of Physics Press, 1995
 Buku Referensi
Britain in the twentieth century : a documentary reader; Vol. II 1939-1970
edited by Lawrence Butler and Harriet Jones
Heinemann ,
 Buku Referensi
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