Religion

Wicca: A Guide For the Solitary Practitioner, by Scott Cunningham

Living Wicca: A Further Guide for the Solitary Practitioner, by Scott Cunningham

Elements of the Druid Tradition, by Philip Car-Gomm

The Druid Way, by Philip Car-Gomm

Druid Craft: The Magic of Wicca & Druidry, by Philip Car-Gomm

Wicca for Men : A Handbook for Male Pagans Seeking a Spiritual Path,

by A. J. Drew

Psychic Self-Defense, by Dion Fortune

The Encyclopedia of Witches and Witchcraft, by Rosemary Ellen Guiley

Celtic Mythology and Religion, by Alexander MacBain

Druid Magic, by Maya Magee Sutton, Ph.D. & Nicholas R. Mann

The Western Way: A Practical Guide to the Western Mystery Tradition, by Caitlín & John Matthews

Celtic Women's Spirituality,  by Edain McCoy

Out of the Shadows: Myths and Truths of Modern Wicca, by Lilith McLelland

Elemental Power: Celtic Faerie Craft & Druid Magic, by Amber Wolf

Earthlight: the Ancient Path to Transformation rediscovering the Wisdom of Celtic & Faery Lore, by R.J. Stewart

The Power Within the Land: The roots of Celtic & Underworld Traditions Awakening the Sleepers & Regenerating the Earth, by R.J. Stewart

The Underworld Initiation: A Journey Towards Psychic Transformation,

by R. J. Stewart

The Rebirth of Witchcraft, by Doreen Valiente

Magic

Real Magic, by Isaac Bonewits

Celtic Tree Mysteries: Secrets of the Ogham, by Steve Blamires

Glamoury: Magic of the Celtic Green World, by Steve Blamires

Esoteric Rune Magic, by D. Jason Cooper

The Complete Book of Incense, Oils and Brews, by Scott Cunningham

Cunningham's Encyclopedia of Magical Herbs, by Scott Cunningham

Cunningham's Encyclopedia of Crystal, Gem and Metal Magic, by Scott Cunningham

Practical Magic : A Book of Transformations, Spells and Mind Magic, by Marian Green

Astral Projection for Beginners, by Edain McCoy

Spellcraft: A Primer for the Young Magician, by Lilith McLelland

The Salem Witches' Book of Love Spells: Ancient Spells From Modern Witches, by Lilith McLelland

The Complete Illustrated Guide to the Runes, by Nigel Pennick 

Secrets of the Runes, by Nigel Pennick

A Practical Guide to the Runes: Their Uses in Divination and Magick, by Lisa Peschel

Rune Lore,  by Edred Thorson

Futhark: A Handbook of Rune Magic, by Edred Thorson

Natural Magic, by Doreen Valiente