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Bender, Barbara. Stonehenge: Making Space. New York: Berg, 1998.

Fowles, John & Barry Brukoff. The Enigma of Stonehenge. New York: Summit Books, 1980.

Lothrop, S. K. "Archaeology of the Diquís Delta, Costa Rica." Cambridge: Peabody Museum, 1963.

Quintanilla, Ifigenia and Patricia Fernandez. "Metallurgy, Balls, and Stone Statuary in the Diquís Delta, Costa Rica: Local Production of Power Symbols." Gold and Power in Ancient Costa Rica, Panama, and Colombia. Ed. Jeffrey Quilter and John Hoopes. Dumbarton Oaks Library and Collections. Currently at press.

Sawyer, John O. and Alton A. Lindsey. Vegetation of the Life Zones in Costa Rica. Indianapolis: The Indiana Academy of Science, 1971. Monograph 2 in a series.

Smith, Anthony. "Spheres of Influence." Madison, Nov/Dec 1999, p52-59.

Stone, D. Z. "A Preliminary Investigation of the Flood Plain of the Río Grande de Térraba, Costa Rica." American Antiquity 9(1):74-88, 1943.

Wallace, David Rains. The Quetzal and the Macaw: The Story of Costa Rica's National Parks. San Francisco: Sierra Club Books, 1992.

Zapp, Ivar and George Erikson. Atlantis in America: Navigators of the Ancient World. Illinois: Adventures Unlimited Press, 1998.

Websites

About Cost Rica--from Yeess Travel www.yeess.com/packages/aboutcostarica.html

Costa Rica Facts--Rara Avis Website www.interlog.com/~rainfrst/cr-toc.html

Costa Rica--World Headquarters Website www.worldheadquarters.com/cr/index.html

The Crow Canyon Archeological Center www.crowcanyon.org

English Heritage www.english-heritage.org.uk/

Harvard Magazine July-Aug 2001 issue www.harvardmagazine.com/archive/01ja/ja01_dept_treasure.html

John W. Hoopes' Website www.ukans.edu/~hoopes/balls/index.htm

Edwin Quesada's Website www.geocities.com/Paris/9111/

Science Frontiers #52, July-Aug 1987 http://www.science-frontiers.com/sf052/sf052a01.htm