Documenti ufficiali
PROJECT BLUEBOOK
https://www.theblackvault.com/documentarchive/project-blue-book/
CONDON REPORT
http://files.ncas.org/condon/text/contents.htm
FBI UFO DOCUMENT
https://vault.fbi.gov/UFO
CIA UFO DOCUMENT
https://www.cia.gov/library/readingroom/collection/ufos-fact-or-fiction
NSA UFO DOCUMENT
https://www.nsa.gov/news-features/declassified-documents/ufo/
DOCUMENTI UFFICIALI DECLASSIFICATI VARI
http://www.theblackvault.com/documentarchive/
UNITED KINGDOM UFO DOCUMENTI
http://www.nationalarchives.gov.uk/ufos/
DOCUMENTI UFFICIALI FRANCESI
http://www.cnes-geipan.fr/
CANADA UFO DOCUMENT
https://archive.org/details/CanadaUFO
AUSTRALIAN UFO DOCUMENT
https://archive.org/details/AustralianUFOFiles
NEW ZEALAND UFO DOCUMENT
http://archives.govt.nz/search/apachesolr_search/UFO
http://www.stuff.co.nz/national/4486327/Original-files-NZs-UFO-sightings