Braeman, John
American politics in the twentieth century
Thomas Y. Crowill, 1969
 Buku Teks
Carter, Gwendolen M.
Government and politics in the twentieth century
Praeger, 1973
 Buku Teks
Schaller, Michael
The united states and China in the twentieth century
Oxford University press, 1979
 Buku Teks
Crockatt, Richard
Einstein and twentieth-century politics: a salutary moral influence
Oxford University Press, 2016
 eBooks
Clubb, O. Edmund
Twentieth century China / O. Edmund Clubb
Columbia University Press, 1978
 Buku Teks