Alan Greenspan, The Roots of the Mortgage Crisis: Bubbles cannot be safely defused by monetary policy before the speculative fever breaks on its own. , the Wall Street Journal, 12 December 2007 McKay, Peter A. (26 July 2005).
Bank for International Settlements.  ^ Alan Greenspan, The Roots of the Mortgage Crisis: Bubbles cannot be safely defused by monetary policy before the speculative fever breaks on its own. , the Wall Street Journal, ngày 12 tháng 12 năm 2007 ^ McKay, Peter A. (ngày 26 tháng 7 năm 2005).