Barbara S. Esker (1990). Performance characteristics of a one-third-scale, vectorable ventral nozzle for SSTOVL aircraft. [Washington, D.C.]: NASA. ISBN9780760770917. OCLC24990569. OL17630526M.
pbs.org
"X-planes".PBS: Nova transcript. Retrieved 9 January 2010.
Barbara S. Esker (1990). Performance characteristics of a one-third-scale, vectorable ventral nozzle for SSTOVL aircraft. [Washington, D.C.]: NASA. ISBN9780760770917. OCLC24990569. OL17630526M.