See Donald Laycock, "Enochian: Angelic language or mortal folly?", 19-64 in The Complete Enochian Dictionary. Also Egil Asprem, "'Enochian' Language: A proof of the existence of angels?" in Skepsis (13.12.2006), http://www.skepsis.no/marginalia/enochian_language_a_proof_of_t.html.