Houdini, Harry. 1924/2011. A Magician Among the Spirits. New York: Cambridge University Press.

Shermer, Michael. 2014. “Infrequencies.” Scientific American, October. http://bit.ly/1rGc4qd.

Sagan, 1996, p. 104.

Coyne, Jerry. 2014. “Science Is Being Bashed by Academics Who Should Know Better.” New Republic, April 3. http://bit.ly/2jVY3CT. Ответ Крайпэла на критику Койна см.: Kripal, Jeffrey. 2014. “Embracing the Unexplained, Part 2.” The Chronicle of Higher Education, April 8. http://bit.ly/2kkTeGt.