Progress in the study of human experience inevitably depends on the accumulated efforts of many people. I am indebted to the following UFO authors, investigators, and witnesses for providing important information used in this book:
George Adamski, Maury Albertson, Orfeo M. Angelucci, Thomas Bearden, Charles Berlitz, Michael Bershad, Ted Bloecher, Howard Blum, Charles Bowen, Lyle G. Boyd, Richard and Lee Boylan, Thomas E. Bullard, John Carpenter, Martin Cannon, Bill Chalker, Aphrodite Clamar, Edward U. Condon, Ed Conroy, Gordon Creighton, William Curtis, Terence Dickinson, Paul Dong, Barry H. Downing, Ann Druffel, George Earley, Don Elkins, Lawrence Fawcett, Edith Fiore, Raymond Fowler, Stanton Friedman, John G. Fuller, Paul Fuller, Encarnacion Garcia, Timothy Good, Elmer Green, Barry J. Greenwood, Bryan Gresh, Richard F. Haines, Leah Haley, Richard H. Hall, James Harder, Richard C. Henry, William J. Herrmann, Charles Hickson, Cynthia Hind, Budd Hopkins, Linda Moulton Howe, Antonio Huneeus, J. Allen Hynek, Philip J. Imbrogno, David M. Jacobs, Donald A. Johnson, Carl G. Jung, Parli R. Kannan, Alvin H. Lawson, Meade Layne, Desmond Leslie, Coral Lorenzen, Jim Lorenzen, Bruce S. Maccabee, John Mack, Victor Marchetti, William Markowitz, James A. McCarty, James E. McDonald, William Mendez, Donald H. Menzel, William L. Moore, Kanishk Nathan, Thornton Page, Ted R. Phillips, William T. Powers, Bob Pratt, Kevin D. Randle, Jenny Randles, Antonio Ribera, Kenneth Ring, Franklin Roach, August Roberts, D. Scott Rogo, Carla Rueckert, Carl Sagan, John R. Salter, Virgilio Sanchez-Ocejo, Ivan Sanderson, David R. Saunders, Larry Savadove, Donald R. Schmitt, John F. Schuessler, Berthold E. Schwarz, Frank Scully, Michael Seligman, Margaret Shaw, Elizabeth Slater, Nicholas Spanos, William S. Steinman, Wendelle C. Stevens, Ronald Story, Whitley Strieber, Barry Taff, Rolf Telano, Karla Turner, Denise and Bert Twiggs, Jacques Vallee, Jean-Jacques Velasco, Ed and Francis Walters, Travis Walton, David F. Webb, Walter N. Webb, Roger Wescott, Dan Wright, Jennie Zeidman, and Lou Zinsstag.
I am also indebted to many other authors, including the following:
D. P. Agrawal, S. Maqbul Ahmad, Vaman S. Apte, St. Augustine, Alice A. Bailey, Prithivi Bamzai, Raja Bano, John Bentley, Bhaktisiddhānta Sarasvatī Goswami Ṭhākura, His Divine Grace A. C. Bhaktivedanta Swami Prabhupāda, Stephen E. Braude, David H. Childress, William R. Corliss, Lawrence Daly, Ramachandra Dikshitar, Theodosius Dobhzhansky, H. M. Elliot, Walter Y. Evans-Wentz, Roland Mushat Frye, Kisari Mohan Ganguli, Robin Green, Edwin S. Hartland, Hudson Hoagland, Hridayānanda Goswami, Francis Johnston, G. R. Josyer, Walter Kafton-Minkel, Dileep Kumar Kanjilal, Kenneth Lanning, Terence Meaden, Janardan Misra, F. W. H. Myers, Christian O’Brien, Richard Ofshe, Gustav Oppert, Satwant Pasricha, J. S. Phillimore, Marmaduke Pickthall, Pope Pius XII, C. S. R. Prabhu, V. Raghavan, Louisa Rhine, Robert Rickard, William Roll, Steven Rosen, Michael Sabom, Sanātana Goswami, Bapu Deva Sastrin, Satsvarūpa Dāsa Goswami, Hari Prasad Shastri, George Gaylord Simpson, Zecharia Sitchin, M. A. Stein, Ian Stevenson, J. A. B. Van Buitenen, Leonid L. Vasiliev, John A. Wheeler, and H. H. Wilson.
I would like to thank Raymond Fowler and Jay Israel for useful criticisms of the manuscript and Michael Cremo for many helpful discussions. I also thank Thomas Doliner, Gary Loscocco, and Jeffrey Soloman for proofreading, Christopher Beetle and Dave Smith for proofreading and typesetting, and Robert Wintermute for layout and design. Others who contributed in various ways are Michael Best, Sigalit Binyaminy, Austin Gordon, Tricia McCannon, and Scott Wolfe. Special thanks to James McDonough and Hawaii Vedic College for investing in the printing of the book.