Web Resources
There is a rapid turnover of UFO material on the Internet. Many links to material on UFO websites quickly become out of date. Therefore, instead of giving many links to specific webpages I have instead focused on providing tables of references to discussion of UFO incidents, personalities and other matters in various books. Those tables of references to discussion in books can be sorted by author, length and date. I hope these tools are useful.
Book References
Discussed by Clark, Jerome in his “The UFO Encyclopedia: The Phenomenon from the Beginning - 2nd edition” (1998) (available on Amazon USA and on Amazon UK) in Volume 2:L-Z at page 953 (part of the entry entitled “University of Colorado UFO Project” at pages 946-959) of the Omnigraphics hardback edition forming.
See also references provided in the main entry for the Condon Report (9 January 1969).
Other Material