Hacker, Louis M., author
McGraw-Hill, 1965
Buku Teks
edited by Nelson Lichtenstein
University of Pennsylvania press, 2006
Buku Teks
Bernstein, Peter L
Doubleday Company, 1962
Buku Teks
Toynbee, Arnold J., author
The Beacon Press , 1961
Buku Teks
Harry S. Dent, author
Prestasi Pustaka, 2001
Buku Teks