Bibliography

1)  http://ethics.cwru.edu/LeMessurier

2) http://www.fkd.aa.no/private/arkitektur/wfloor.htm

3) http://www.nypl.org/research/chss/spe/art/photo/hinex/empire

4) http://www.sears-tower.com

5) http://www.arch.gatech.edu/~whit/sec_1_2

6) "Skyscrapers", Encyclopedia Britannica. 1989, Vol. 10, pg. 870.

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