Beyond the Occult, the third book in Colin Wilson’s “Occult Trilogy”, was published late in 1988, both in the UK and the US, by Bantam Press. It was the culmination of twenty years’ research into the paranormal which commenced with the publication of a huge volume, The Occult, in 1971 and was followed by the equally bulky Mysteries in 1978. The decision to write a book about the occult, against the advice of Robert Graves (1895-1985), turned out to be advantageous to Wilson as the books were, mostly, well received and spawned many popular spin-offs. Indeed, it is difficult to imagine how he could have supported himself and his growing family, post-1970, without undergoing more arduous lecture …
Stanley, Colin. "Beyond the Occult". The Literary Encyclopedia. First published 09 March 2012; last revised 30 November -1.
[http://www.litencyc.com/php/sworks.php?rec=true&UID=23994, accessed 25 April 2015.]