1) Catalogues of Sighting Reports

– Euro Ufo Index: Catalog of European UFO reports and sightings

2) Thematic Bibliographies and Listings

– UPID: Ufo Periodicals International Directory

– UFO Theses: University Theses and Dissertations about UFOs

3) Personal Bibliographies

– Björn Borg’s Bibliography

– Edoardo Russo’s Bibliography

– Franck Boitte’s Bibliography

– Marco Bianchini’s Bibliography

– Marco Orlandi’s Bibliography

– Paolo Fiorino’s Bibliography

– Vicente-Juan Ballester Olmos’ Bibliography