Dinniss, Heather Harrison, author
Cambridge University Press, 2012
Buku Teks
Ambrose, Stephen E., author
Simon & Schuster, 2004
Buku Teks
edited by Paul Bohannan
University of Texas Press, 1967
Buku Teks
Harris, Sheldon H., author
Routledge, 1994
Buku Teks
Schlesinger, Robert J.
Prentice-Hall, 1961
Buku Teks