How UFO Sightings Became an American Obsession | WIRED
Flying Saucers From Outer Space: Keyhoe, Donald E.: Amazon.com: Books
Crash from Outer Space: Unraveling the Mystery of Flying Saucers, Alien Beings, and Roswell (Pre-Owned Hardcover 9781338829464) by Candace Fleming - Walmart.com
Pentagon ran secret multi-million dollar UFO programme | RNZ News