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, Houis L.
World in the twentieth century / by Houis L.Snyder
Princeton University Press, 1964
 Buku Teks
Keylor, William R., 1944-
The twentieth-century world : an international history
Oxford University Press, 1996
 Buku Teks
Proctor, George A.
Canadian music of the twentieth century / George Alfred Proctor
University of Toronto Press, 1980
 Buku Teks