There's a wonderful new book out that I have just barely had time to crack open, but if you're interested in the history of magic you will doubtless want to look into it as well:
Traditional Magic Spells for Protection and Healing
By Claude Lecouteux. 2016. Rochester: Inner Traditions. 328 pages.
ISBN: 978-1-62055-621-4
There's a comprehensive review over at the Journal of Folklore Research, which is why I picked it up at once. Yelena Francis points out the strengths of Lecouteax's background and the accessibility of the format. There are also some great additional and often rare resources in the appendices. And because it's from Inner Traditions rather than a big academic press, it's actually an affordable volume (though you should be able to get it via interlibrary loan as well).
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