Braeman, John
American politics in the twentieth century
Thomas Y. Crowill, 1969
Buku Teks SO
Gray, Richard, 1944-
American poetry of the twentieth century
Longman, 1991
Buku Teks SO
Berkowitz, Gerald M.
American drama of the twentieth century
Longman, 1994
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Bonner, Thomas Neville
Our recent past : American civilization in the twentieth century
Prentice-Hall, 1963
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Pearson, Frederic S.
International relations : the global condition in the late twentieth century
McGraw-Hill, 1992
Buku Teks SO