Lilley, Steve K. (August 2010). "Hit the Bricks"(PDF). System Failure Case Studies. 4 (8). NASA: 1–4. Archived from the original(PDF) on 28 September 2011. Retrieved 20 July 2011.
history.nasa.gov
Fries, Colin (June 25, 2007). "Chronology of Wakeup Calls"(PDF). NASA. Archived(PDF) from the original on June 20, 2010. Retrieved August 13, 2007.
Lilley, Steve K. (August 2010). "Hit the Bricks"(PDF). System Failure Case Studies. 4 (8). NASA: 1–4. Archived from the original(PDF) on 28 September 2011. Retrieved 20 July 2011.