0-89747-088-5. Taylor, John W.R. "Grumman F6F Hellcat." Combat Aircraft of the World from 1909 to the present. New York: G.P. Putnam's Sons, 1969. ISBN 0-425-03633-2
2021) (英语). Northrop Grumman selects subcontractors for new ICBM missile system. UPI. [2021-05-19]. (原始内容存档于19 May 2021) (英语). Frank G. Klotz, Alexandra