Keylor, William R., 1944-
The twentieth-century world : an international history
Oxford University Press, 1996
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Readings in twentieth-century European history
edited by Alexander Baltzly, A. William Salomone
Appleton-Century-Crofts, 1950
 Buku Teks SO
Palmer, Alan
The penguin dictionary of twentieth-century history 1900-1982
Penguin Books , 1987
 Buku Referensi
Kragh, Helge
Quantum Generations : A History of Physics in the twentieth century
Princeton University press, 1999
 Buku Teks SO
Readings in Twentieth-Century European History
edited by Alexander Baltzly
Appleton-Century-Crofts, Inc, 1950
 Buku Teks SO