1. l. Collins, Michael, Liftoff, The Story of America's First Adventure in Space, Grove Press, January 1988,pp.65-66.
2. Mantus, M., Lerner, E. and Elkins, W., Landing Dynamics of the Lunar Excursion Module (Method of Analysis), Report LED-520-6, Grumman Aircraft Engineering Corp. March6,1964.
3. Landing dynamics of the Lunar Excursion Module.