While it's admittedly not a scholarly source, and while National Geographic clearly called in the B team when it came to web design, their site on the Salem Witch Trials is a great introduction and presents basic information on the dynamics of a witch trial in a very memorable format. It's a good supplement.
I've already done an abstract of Reis's conference paper "Revelation, Witchcraft, and the Danger of Knowing God’s Secrets," and I still admire its concision and breadth. It's thought-provoking without being too specific for an undergraduate course.
Finally, while Mather's Wonders of the Invisible World is large enough to function better as a primary text, pages 5-17 reveal a good deal about the apocalypticism and bunker mentality of the Puritans, and make for interesting, if not particularly riveting, reading.