^Couttie, Bob. (1988). Forbidden Knowledge: The Paranormal Paradox. Lutterworth Press. p. 62. ISBN978-0-7188-2686-4 "The case remains very controversial. Grosse, Playfair, Hasted and others believe it was genuine, Anita Gregory and other members of the SPR were unconvinced. Magicians and ventriloquists came to the conclusion that Janet was cheating."
^Playfair, Guy Lyon. This House Is Haunted: The True Story of a Poltergeist. Stein and Day. 1980. ISBN 978-0-7387-1867-5.
^Guiley, Rosemary (1994). The Guinness Encyclopedia of Ghosts and Spirits. Guinness World Records Limited. p. 109. ISBN978-0851127484
^Clarkson, Michael. (2006). Poltergeists: Examining Mysteries of the Paranormal. Firefly Books. p. 135. ISBN978-1554071593 "Anita Gregory, of the Society for Psychical Research, who had spent just a short time at the Hodgson home, said the mysterious men's voices were simply the result of Janet and Margaret putting bed sheets to their mouths. In addition, Gregory said that a video camera had caught Janet attempting to bend spoons and an iron bar by force and 'practicing' levitation by bouncing up and down on her bed."
^Carlson, H. G. (1994). Mysteries of the Unexplained. Contemporary Books. p. 46. ISBN978-0809234974
^Haynes, Renée. (1982). The Society for Psychical Research 1882–1982: A History. MacDonald & Co. p. 112. ISBN978-0356078755
^Clarkson, Michael. (2006). Poltergeists: Examining Mysteries of the Paranormal. Firefly Books. p. 131. ISBN978-1554071593
^Nickell, Joe. The Haunted Tape Recorder. CSI. Committee for the Scientific Investigation of Claims of the Paranormal. September 1995 [2018-04-14]. (原始内容存档于2018-12-06).