Gemma Gary - Traditional Witchcraft: A Cornish Book of Ways
Nigel Pearson - Treading the Mill
Robin Artisson - The Witching Way of the Hollow Hill
Peter Paddon - A Grimoire for Modern Cunningfolk
Shani Oates -Tubelo's Green Fire
Most of these authors have other worthwhile books as well that you can pursue if you like what you're reading, but I thought I'd give you some starting points. I'm especially a fan of Robin Artisson, who has probably the most philosophical depth of these authors, and Gemma Gary.