Connor, Steven (1999). "9. The Machine in the Ghost: Spiritualism, Technology and the 'Direct Voice'". In Buse, Peter; Stott, Andrew (eds.). Ghosts: deconstruction, psychoanalysis, history. Palgrave Macmillan. p. 203–25. ISBN978-0-312-21739-6.
"Spiritism is not a religion but a science", as the famous French astronomer Camille Flammarion said in Allan Kardec's Eulogy on April 2, 1869, in Death and Its Mystery – After Death. Manifestations and Apparitions of the Dead; The Soul After Death Translated by Latrobe Carroll (London: Adelphi Terrace, 1923), archive version at Allan Kardec eulogy