1. Pioneer in Supersonic Flight, the Bell X-1;Air Force,1953
2. Alden, Edward. “Measuring the Effectiveness of Border Enforcement.” Council on Foreign Relations, March 14, 2013. https://www.cfr.org/report/measuring-effectiveness-border-enforcement.
3. American Civil Liberties Union. “Al-Aulaqi v. Panetta—Constitutional Challenge to Killing of Three US Citizens.” ACLU, June 4, 2014. https://www.aclu.org/cases/al-aulaqi-v-panetta-constitutional-challenge-killing-three-us-citizens.
4. Biography