Clulee, Nicholas H.; Vickers, Brian (1984). "At the crossroads of magic and science: John Dee's Archemastrie". In Vickers, Brian (ed.). Occult and scientific mentalities in the Renaissance. p. 59. doi:10.1017/CBO9780511572999.003. ISBN9780511572999.
(p. 692) Power, Amanda. (2006). "A Mirror for Every Age: The Reputation of Roger Bacon". The English Historical Review. 121 (492): 657–692. doi:10.1093/ehr/cel102.