Here's a list of books on Traditional Witchcraft and magic. I'm sure there are dozens of others, so feel free to add your suggestions in the comments!
~Practical Reading~
?Traditional Witchcraft: A Cornish Book of Ways
- Gemma Gary
?A Deed Without A Name: Unearthing the Legacy of Traditional Witchcraft
- Lee Morgan
?Treading the Mill: Practical Craft Working in Modern Traditional Witchcraft
- Nigel G. Pearson
?Call of the Horned Piper
- Nigel Aldcroft Jackson
?The Way of the Shaman
- Michael Harner (Traditional Witchcraft has quite a few shamanistic attributes, making this worth the read)
?Mastering Witchcraft: A Practical Guide for Witches, Warlocks and Covens
- Paul Husson (it?s more Wicca based, but it?s a classic with some very strong points)
?Village Witch
- Cassandra Latham-Jones
?Devon Witchcraft and Folk Ways
- Sarah Hewett
?Secrets of East Anglian Magic
- Nigel Pennick
?A Grimoire for Modern Cunning Folk: A Practical Guide to Witchcraft on the Crooked Path
- Peter Paddon
?Crone?s Book of Charms and Spells/Crone?s Book of Magical Words*
- Valerie Worth
?The Black Toad: West Country Witchcraft and Magic*
- Gemma Gary
*= These are really just spell books with not much else in them. They?re good, but not if you want to understand deeper the spiritual side of Traditional Witchcraft.
~Historical Reading~
?Cunning Folk and Familiar Spirits
- Emma Wilby
?Popular Magic: Cunning-folk in English History
- Owen Davies
?Witchcraft in Early North America
- Alison Games
?The Archaeology of Ritual and Magic
- Ralph Merrifield
?The Power of Words: Studies on Charms and Charming in Europe
- James A. Kapalo, Eva Pocs and William Francis Ryan
?The Tradition of Household Spirits: Ancestral Lore and Practices
- Claude Lecouteux
?Between the Living and the Dead
- Eva Pocs
?Ecstasies: Deciphering the Witches? Sabbath
- Carlo Ginzburg and Raymond Rosenthal
?The Night Battles: Witchcraft & Agrarian Cults in the Sixteenth & Seventeenth Centuries
- Carlo Ginzburg, John Tedeschi and Anne Tedeschi
?Witches, Werewolves, and Fairies: Shapeshifters and Astral Doubles in the Middle Ages
- Claude Lecouteux