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Alternatively it can be seen more broadly as part of the tradition of mystical literature described in William James ' " The Varieties of Religious Experience " and Aldous Huxley 's " The Perennial Philosophy " .
 William James, Aldous Huxley
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 William James, Aldous Huxley