Bennett 1998, p. 113 citing Muir's 1858 Life, vol. 2, p. 90f; Bennett traces the Satanic influence theory Bennett, Clinton (1998). In search of Muhammad. Continuum International Publishing Group. ISBN978-0-304-70401-9.
Bennett 1998, p. 113 paraphrases Muir's 1894 edition of Life, p. 505, but the passage quoted here is in Muir's own words Bennett, Clinton (1998). In search of Muhammad. Continuum International Publishing Group. ISBN978-0-304-70401-9.