We are not alone: the extraordinary history of UFOs and aliens invading our hopes, fears and fantasies

Attack of the flying saucers : a modern phenomenon begins

Close encounters : alien contactees and abductees

The phenomenon continues : mass sightings, conspiracies, and flying triangles

The search for extraterrestrial intelligence : scientific exploration from Galileo to the Galileo project

The truth is out there, officially : The government acknowledges UFOs.