l’Aquatique (Wikicommons): p. 123.
B575 (Wikicommons): p. 271.
Jeffrey Beall: p. 343.
J. T. Blatty: p. 307.
Brunswick Records: p. 39.
Hereward Carrington: p. 313.
Daniel Case: p. 142.
Cbc717: p. 264.
CBS Television: p. 53.
George Chriss: p. 266.
Cline Library, Northern Arizona University: p. 153.
Cmichel67 (Wikicommons): p. 14.
The Day Book: p. 221.
Leslie K. Dellovade: p. 250.
Kevin Dooley: p. 65.
Dun.can (Wikicommons): p. 96.
EmbraerSkyPilot (Wikicommons): p. 117.
Benjamin D. Esham: p. 79.
Federal Aviation Administration: p. 276.
C. S. Fly: p. 191.
Riccardo Ghilardi: p. 32.
C. L. K. Hatcher: p. 255.
Heritage Auctions: p. 90.
Guy Hottel: p. 329.
Internet Archive Book Images: p. 94.
Jan’s Cat (Wikicommons): p. 114.
Jengod (Wikicommons): p. 82.
Brian Josephson: p. 15.
Journal of Parapsychology: p. 318.
Library of Congress: pp. 34, 45, 78, 204, 269, 286, 348.
Los Angeles (Wikicommons): p. 248.
MGM Television: p. 58.
Gary Minnaert: p. 70.
Peter Moore: p. 231.
National Park Service: p. 227.
Scott Oldham: p. 101.
Onetwo1 (wikicommons): p. 340.
John O’Neill: p. 72.
Ormr2014 (Wikicommons): p. 322.
Benjamin Radford: p. 284.
Pascal Rehfeldt: p. 232.
Renelibrary (Wikicommons): p. 224.
Revere Senior High School: p. 52.
Rievse (Wikicommons): p. 103.
RKO: p. 30.
Scanpix: p. 42.
Seulatr (Wikicommons): p. 303.
Shutterstock: pp. 2, 5, 7, 8, 10, 13, 18, 20, 23, 24, 28, 36, 47, 48, 61, 75, 125, 133, 137, 146, 150, 156, 161, 163, 166, 171, 172, 177, 181, 185, 188, 194, 206, 207, 211, 213, 215, 219, 229, 238, 241, 244, 257, 288, 293, 320, 323, 326, 332, 362.
Siebbi (Wikicommons): p. 56.
Gage Skidmore: p. 305.
Slate magazine: p. 119.
Smallbones (Wikicommons): p. 202.
Bowie Snodgrass: p. 144.
Brad A. Totman: p. 108.
Tuxyso (Wikicommons): p. 209.
U.S. Army: p. 168.
U.S. Navy: p. 110.
Bill Whittaker: p. 175.
Public domain: pp. 19, 196, 217, 253, 279, 290, 295, 297, 315, 353, 358.