Richard K. Betts. Statement and testimony in U.S. Senate Committee on Governmental Affairs, Hearing: S.1867 — A Bill to Establish the National Commission on Terrorist Attacks Upon the United States, 107th Cong., 2d sess., February 2002. 

Statement and testimony in U.S. Senate Committee on Governmental Affairs, Hearing: S.1867 — A Bill to Establish the National Commission on Terrorist Attacks Upon the United States, 107^th Cong., 2d sess., February 2002.