1. The UFO Encylcopedia by Margaret Sachs.
2. Project Moondust by Kevin D. Randle
Page 185-187. Lieutenant Colonel Charles Halt letter to the Royal Air Force Commander.
3. Alien Base by Timothy Good
4. The Emergence of a Phenomenon: UFOs from the Beginning through 1959 By Jerome Clark.
5. UFOs in the 1980s By Jerome Clark.
6. ABC's Peter Jennings UFO special Seeing Is Believing (February 25, 2005)
7. The Definitive Guide To Unidentified Flying Objects And Related Phenomena By David Ritchie.
8. Alien Abductions 2004 DVD - Dr. Roger Leir.
9. Intruders - Budd Hopkins
10. The Great Unsolved Mysteries Of Science By John Grant/ Is There Such A Thing As Antigravity?
11. The Abduction Enigma By Kevin D. Randle, Russ Estes, and William P. Cone, Ph.D.
12. Making Contact Edited by Bill Fawcett
13. Need To Know: UFOs, The Military and Intelligence by Timothy Good
14. Out Of This World: Mysteries Of Mind, Space And Time - Black Cat (This edition published in 1989)
15. Mysteries Of The Unexplained - Readers Digest