«Չբացահայտված թռչող օբյեկտ»–ի խմբագրումների տարբերություն

* [http://ucblibraries.colorado.edu/govpubs/us/ufos.htm "Government Reports on UFOs"]

* [https://www.cia.gov/library/center-for-the-study-of-intelligence/csi-publications/csi-studies/studies/97unclass/ufo.html "CIA's Role in the Study of UFOs, 1947-90"]

* [https://www.gov.uk/government/publications/ufo-reports-in-the-uk "UFO Reports in the UK"]

* [http://www.nationalarchives.gov.uk/ufos/ "Newly released UFO files from the UK government"]

* [http://www.collectionscanada.gc.ca/ufo/ "Canada's UFOs: The Search for the Unknown"]