[[XIII-7]] Keyhoe, D. E. Flying Saucers: Top Secret. New York: G. P. Putnam’s Sons, 1960.
[[XIII-8]] Lorenzen, C. E. “The Psychology of UFO Secrecy,” Flying Saucers (October 1958), p. 12 ff.
[[XIII-9]] Davidson, L. [Letter] Flying Saucers (October 1958), p. 79.
[[XIII-10]] Davidson, L. “An Open Letter to Saucer Researchers,” Flying Saucers (March 1962), p. 36.
[[XIII-11]] The Fitzgerald Report, The UFO Research Committee of Akron, Ohio, 1958.
[[XIII-12]] Air Force Files.
[[XIII-13]] Project Blue Book, Special Report No. 14, ATIC, Wright-Patterson Air Force Base, Ohio. May 5, 1955.
[[XIII-14]] New York Times, February 28, 1960.