Glyn Parry, The Arch Conjuror of England: John Dee (New Haven: Yale University Press, 2011)Background reading for my SBL paper for this year: The 94 Books of Ezra and the Angelic Revelations of John Dee.
Egil Asprem, Arguing with Angels: Enochian Magic & Modern Occulture (Albany: SUNY, 2012)
Egil Asprem's blog, to which I link from time to time, is Heterodoxology. Related post and links here.