Introduction to Tantra Shastra by John Woodroffe. Originally the extented introduction to a translation of the Mahanirvana Tantra by "Arthur Avalon" (a collective pseudonym for Woodroffe and an unnamed collaborator), this is a sufficiently general treatment to repay reading apart from the work to which it was originally attached. While there are a few caveats, Woodroffe was the first Western writer to treat seriously and sympathetically of the Sakta Tantrik cults and their scriptures.