Maailma kaubanduskeskuste oletatavad kokkuvarisemise põhjused uurimistöö
htm
World Trade Center History. (n.d.). Retrieved from
http://www.werismyki.com/artcls/wtc_history.html
Pilt 1 - USA today, 2001 Retrieved from
http://www.tms.org/pubs/journals/jom/0112/eagar/eagar-0112.html
Pilt 2 - Balthazar Korab, 2001 . World Trade Center towers Retrieved from
http://www.greatbuildings.com/cgi-
bin/gbi.cgi/World_Trade_Center.html/cid_wtc_mya_WTC_finished2.html
Pilt 3 – Scott Demel, 2001. Attack Retrieved from http://www.demel.net/wtc-
1.html
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LISAD
Pilt 2 – (Korab, 2001, World Trade Center towers)
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Pilt 3 - (Demel, 2001, Attack)
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annaabi.ee 
