The AH books and resources list is your friend, but as its recommendations are scattered through a mainly geographical listing, I will compile some of the key cites for you here.

Religion and the Decline of Magic by Keith Thomas (1971): One of the pioneering works on how anthropology can help our study of history focusing on superstition in the late medieval/early modern period, this is a fantastic read and a real insight into a still-young school of historical analysis.

Thinking with Demons by Stuart Clark (1999): this is one of two mandatory books on Early Modern Witchcraft (the other is Keith Thomas' Religion and the Decline of Magic). It's hard to summarize what is a monumental piece of work, but examines the idea of witches and how that idea functions through different intellectual sections of life. It has a bibliography that will make you weep with inadequacy and throw your work into the nearest witch-bonfire.

The Triumph of the Moon: A History of Modern Pagan Witchcraft by Ronald Hutton (1999). A study of the history and development of modern Pagan Witchcraft.

Blood and Mistletoe: The History of the Druids in Britain by Ronald Hutton (2009). A history of the intertwined development of modern Celtic scholarship and religious revivalism in Britain.

The Witch-Hunt in Early Modern Europe by Brian Levack: Levack gives important background and context to his discussion of the witch-hunt. The work's value as an introduction to the topic is evident, as the book is now in its third edition.

Theology and the Scientific Imagination: From the Middle Ages to the Seventeenth Century Funkenstein, Amos. 1986. An interesting read detailing the various views of emerging scientific thought and the prevalence of religious faith. The book takes time to work from a sociological as well as historical viewpoint to allow for a broader take.