The Truth is Out There: The Official Guide to The X-Files, Volume 1 (1995) by Brian Lowry
X-files Confidential (1996) by Ted Edwards
The Official Map of the X-Files (1996) by Chris Carter
Science of The X-Files: The Truth... (1996) by Michael White
Trust No One: The Official Guide to the X-Files, Volume 2 (1996) by Brian Lowry
The X-Files Confidential: Series 1 (1997) by Ted Edwards
Scully Exposed: The Unauthorised Biography of X-Files Superstar Gillian Anderson (1997) by Nadine Crenshaw
Beyond the Sea (1997) by Chris Carter
The Art of The X-Files (1998)
I Want to Believe Everything: The Official Guide to the X-Files, Volume 3 (1998) by Andy Meisler
The Making of the X-Files Movie (1998) by Jody Duncan
Resist or Serve: The Official Guide to the X-Files, Volume 4 (1999) by Andy Meisler
The X-Files Episode Guide (2001) by Marc Shapiro
1. Goblins (1994) by Charles L Grant
2. Whirlwind (1995) by Charles L Grant
3. Ground Zero (1995) by Kevin J Anderson
4. Ruins (1996) by Kevin J Anderson
5. Antibodies (1997) by Kevin J Anderson
6. Skin (1999) by Ben Mezrich

1. The Calusari (1997) by Garth Nix
2. Eve (1997) by Ellen Steiber
3. Bad Sign (1995) by
4. Our Town (1997) by Eric Elfman
5. Empathy (1997) by Ellen Steiber
6. Fresh Bones (1997) by Les Martin
7. Control (1997) by Everett Owens
8. The Host (1997) by Les Martin
9. Hungry Ghosts (1998) by Ellen Steiber
10. Dark Matter (1999) by
11. Howlers (1998) by Everett Owens
12. Grotesque (1999) by Ellen Steiber
13. Quarantine (1999) by Les Martin
14. Regeneration (1999) by Everett Owens
15. Haunted (2000) by Ellen Steiber
16. Miracle Man (2000) by Terry Bisson

1. X Marks the Spot (1995) by Chris Carter and Les Martin
2. Darkness Falls (1995) by Les Martin
3. Tiger, Tiger (1995) by Les Martin
4. Squeeze (1996) by Ellen Steiber
5. Humbug (1996) by Les Martin
6. Shapes (1996) by Ellen Steiber
7. Fear (1996) by Les Martin
8. Voltage (1996) by Les Martin and
9. E.B.E. (1996) by Les Martin and
10. Die, Bug, Die! (1997) by Les Martin
11. Ghost in the Machine (1997) by Les Martin

Dead to the World (1996) by Stefan Petrucha
Afterflight (1997) by Stefan Petrucha
1. Firebird (1995) by Stefan Petrucha
2. Project Aquarius (1996) by Stefan Petrucha
3. The Haunting (1996) by Stefan Petrucha
5. Internal Affairs (1997) by John Rozum
6. Remote Control (1997) by John Rozum
7. Skin Deep (1998) by John Rozum and Alex Saviuk

Ascension (1997) by
Fight the Future (1998) by Chris Carter and Elizabeth Hand
The X-Files Movie (1998) by Chris Carter
I Want to Believe: X-files Movie Novelisation (2008) by Max Allan Collins
3. Hunter (1995) by Charles L Grant