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
Snyder, Louis L.
World in the twentieth century
Princeton University Press, 1964
 Buku Teks SO
The historian and the world of the twentieth century
by Marino Berengo ... [and others]
American Academy of Arts and Sciences, 1971
 Buku Teks SO
Keylor, William R., 1944-
The twentieth-century world : an international history
Oxford University Press, 1996
 Buku Teks