1. ^{{cite book |title=An Encyclopaedia of Occultism |authorlink=Lewis Spence |last=Spence |first=Lewis |page=279 |year=2003 |origyear=1920 |publisher=Courier Dover Publications [Routledge] |isbn=978-0-486-42613-6 }}
2. ^{{cite book |title=The history of the supernatural in all ages and nations, and in all churches, Christian and pagan: demonstrating a universal faith |authorlink=William Howitt |last=Howitt |first=William |page=6 |year=1863 |publisher=Longman, Green, Longman, Roberts, & Green |oclc=6352154 }}
3. ^{{cite book |title=History of Magic, Part 1 |last=Ennemoser |first=Joseph |author2=Mary Botham Howitt |author3=William Howitt |page=16 |year=2002 |origyear=1854 |publisher=Kessinger Publishing [Henry G. Bohn] |isbn=978-0-7661-2635-0 |oclc=270150 }}