Wynot, Edward D., author
University of Georgia Press, 1974
Buku Teks
Beal, Tim, author
Pluto Press, 2005
Buku Teks
Lairson, Thomas D., author
Thomson, 2003
Buku Teks
Hardin, Charles M., author
Free Press, 1952
Buku Teks
Caro, Robert A., author
Alfred A. Knopf, 1983
Buku Teks