1. Recommendations to Improve the Federal Flight Deck Officer Program. White Paper;ALPA,2007
2. Secondary Flight Deck Barriers and Flight Deck Access Procedures: A Call for Action. White Paper;ALPA,2013
3. ALPA Supports Senate FAA Reauthorization Bill;ALPA,2016
4. United airlines installing secondary security barrier for cockpit protection;Aviation Today;Aviation Today,2004
5. Violence in the Skies: A History of Aircraft Hijacking and Bombing;Baum,2016