Hendry, A., 1979, The UFO Handbook: A Guide to Investigating, Evaluating and Reporting UFO Sightings: Garden City, New York, Doubleday & Co., 297 p.
Klass, P. J., 1968, UFOs--Identified: New York, Random House, 290 p.
Page, T., and Sagan, C., 1972, UFOs: A Scientific Debate: Ithaca, New York, Cornell University Press.
Saunders, D. R., and Harkins, R. R., 1968, UFO's? Yes!: Where the Condon Committee Went Wrong: New York, World Publishing Company, 256 p.
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