Toynbee, Arnold J., author
Meridian Books, 1958
Buku Teks
Brinton, Crane, 1898-1968, author
Prentice-Hall, 1964
Buku Teks
Reilly, Kevin, author
Harper and Row, c1980
Buku Teks
Columbia University Press, 1946
Buku Teks
edited by Brian Tierney, Donald Kagan, and L. Pearce Williams; consulting editor: Eugene Rice.
Random House, 1968
Buku Teks