↑ See section on Ancient Astronauts in The Human Myth: an Introduction to Anthropology by Michael D. Olien, Harper & Row, 1978
↑ Lieb, Michael (1998). Children of Ezekiel: Aliens, Ufos, the Crisis of Race, and the Advent of End Time. Duke University Press. p. 250
1 2 Von Däniken, Erich (1984). Chariots of the Gods. Berkley Pub Group.
↑ Bullard, Thomas E. "The Rarer Abduction Episodes." In: Pritchard, Andrea & Pritchard, David E. & Mack, John E. & Kasey, Pam & Yapp, Claudia. Alien Discussions: Proceedings of the Abduction Study Conference. Cambridge: North Cambridge Press, 1994. Pp. 72-74.
↑ Miller, John G. "Medical Procedural Differences: Alien Versus Human." In: Pritchard, Andrea & Pritchard, David E. & Mack, John E. & Kasey, Pam & Yapp, Claudia. Alien Discussions: Proceedings of the Abduction Study Conference. Cambridge: North Cambridge Press, 1994. pp. 59–64
↑ Randles, J; Pritchard A; Pritchard DE; Mack JE; Kasey P & Yapp C (1994). "Why are They Doing This?". Alien Discussions: Proceedings of the Abduction Study Conference. Cambridge: North Cambridge Press. pp. 69–70.
