| Gareth Stevens Pub, January 1, 2013, cover price $10.50 | About this edition:
Presents information about space aliens and ufos, looking at sightings of them, aliens in literature, some of the controversial evidence for them, and some of the ways that strange phenomena can be explained without bringing up aliens.
| Gareth Stevens Pub, January 1, 2013, cover price $26.60
| Bearport Pub Co Inc, August 1, 2006, cover price $25.27 | About this edition:
Presents stories of close encounters, alien abductions, and UFO sightings, and lets the reader decide if it is fact or fiction.