Knight, Peter (2008). «Outrageous Conspiracy Theories: Popular and Official Responses to 9/11 in Germany and the United States». New German Critique. 35: 165–93. doi:10.1215/0094033X-2007-024
Poteshman, Allen M. (2006). «Unusual Option Market Activity and the Terrorist Attacks of September 11, 2001». The Journal of Business. 79 (4): 1703. doi:10.1086/503645