Morris, Richard B.
Van Nostrand Reinhold, 1955
Buku Teks
Dull, Jonathan R
Yale University Press, 1985
Buku Teks
edited by Bruce Catton
American Heritage, 1958
Buku Teks
edited by Jack P. Greene, J.R. Pole
Blackwell , 1994
Buku Referensi
Berkowitz, Gerald M.
Longman, 1994
Buku Teks