With books I can't help, but I can suggest some articles that cover method.
* W.J. Hanegraaff, ‘Some Remarks on the Study of Western Esotericism’,
Esoterica 1, <www.esoteric.msu.edu> (1999)
* Arthur Versluis wrote two articles in the volumes IV and V of the same
webjournal.
And of course, Hanegraaffs book on New Age covers the topic as well, but it
is older than the abovementioned article. Thus, it should contain nothing new.
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