مراجع
- ^ Jolly, Martyn. (2006). Faces of the Living Dead: The Belief in Spirit Photography. Miegunyah Press. pp. 98-106. (ردمك 978-0712348997)
- ^ Sladek, John Thomas. (1974). The New Apocrypha: A Guide to Strange Sciences and Occult Beliefs. Panther. p. 215. (ردمك 978-0586039748) "Doubts were raised about the work of the British spirit photographer William Hope in 1908, when two of his clients each claimed that one of his ghostly 'extras' was their close relative. Hope continued to practice, though, and managed to con Conan Doyle and several prominent psychic researchers."
- ^ Brock, William Hodson. (2008). William Crookes (1832-1919) and the Commercialization of Science. Ashgate. p. 474. (ردمك 978-0754663225)
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