References
Covington, Richard. The Leaning Tower of Pisa Straightens Up; Smithsonian,
June 2001 pp 41-47.
Article Summary: http://www.smithsonianmag.com/smithsonian/issues01/jun01/pisa.html
Imperial College Engineer, Journal of the City and Guilds College Association,
Imperial College, UK ¿ various articles and reports: http://www.cgca.org.uk/magazine/
La Torre di Pisa Official Website
http://torre.duomo.pisa.it/index_eng.html
Leaning Tower of Pisa Unofficial Website Tower Basics
http://www.endex.com/gf/buildings/ltpisa/ltpinfo.htm
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