http://www.cfr.org/economics/timeline-
global-economy-crisis/p18709
http://historiadelascrisis.com.mx/main/page_inicio.html
http://www.washingtonpost.com/wp-srv/business/creditcrisis/
http://historiadelascrisis.com.mx/
main/page_lneas_del_tiempo.html
http://news.bbc.co.uk/hi/spanish/specials/2008/
crisis_financiera/newsid_7629000/7629122.stm