Bonner, Thomas Neville
Our recent past : American civilization in the twentieth century
Prentice-Hall, 1963
 Buku Teks
Nelson Mandela in his own words : from freedom to the future : tribute and speeches
Edited by Kader Asmal, Davud Chidester, Wilmot James
Abacus, 2013
 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
Braeman, John
American politics in the twentieth century
Thomas Y. Crowill, 1969
 Buku Teks