Carter, Gwendolen M.
Government and politics in the twentieth century
Praeger, 1973
 Buku Teks
Gray, Richard, 1944-
American poetry of the twentieth century
Longman, 1991
 Buku Teks
Berkowitz, Gerald M.
American drama of the twentieth century
Longman, 1994
 Buku Teks
Ideology and politics in twentieth century China
edited by King-yuh Chang
Institute of International Relations, National Chengchi University, 1988
 Buku Teks
Crockatt, Richard
Einstein and twentieth-century politics: a salutary moral influence
Oxford University Press, 2016
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