== Yderligere læsning ==
* {{cite book|author1=John Booth|author-link1=John Booth (magician)|title=Psychic Paradoxes|url=https://archive.org/details/psychicparadoxes0000boot|date=1986|publisher=Prometheus Books|location=Buffalo, New York|isbn=0879753587}}
* {{cite book|author1=Andrew Neher|title=Paranormal and Transcendental Experience: A Psychological Examination|url=https://archive.org/details/paranormaltransc00nehe|url-access=registration|date=1990|publisher=[[Dover]]|location=New York|isbn=0486261670|edition=2nd}}
* {{cite book|author1=James Randi|author-link1=James Randi|title=[[Flim-Flam!|Flim-Flam! Psychics, ESP, Unicorns, and Other Delusions]]|date=1987|publisher=Prometheus Books|location=Buffalo, New York|isbn=0879751983|edition=9th|chapter=Chapter 5: "The Giggling Guru: A Master of Levity"}}
* {{cite journal|author1=Gordon Stein|author-link1=Gordon Stein|title=The Levitation of the Lore|journal=[[Skeptical Inquirer]]|date=Spring 1989|volume=13|issue=2|pages=277–288}}
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