Hooker, Richard. The scientific revolution [online]. [cit. 2009-03-16]. Dostupné v archivu pořízeném dne 2007-10-11.
Objections to Astrology: A Statement by 186 Leading Scientists [online]. The Humanist, September/October 1975 [cit. 2009-03-15]. Dostupné v archivu pořízeném dne 18-03-2009.