Abridged from: Sign Oral History Project, “History of the United States Air Force UFO Programs” (1947-1969), esp.: http://sohp.us/sign_oral_history_project/usaf/the_cia_robertson_panel.php. In addition: Jacobs, David M. The UFO Controversy in America (Bloomington, IN: Indiana University Press, 1975), 134-135.