Academic studies
If you want to learn about the real faerie world from someone who visits it regularly, read almost any book by R. J. Stewart. They're like textbooks; they're not 'light' reading. But, they're among the best. (Unfortunately, they're often out-of-print. If you find a copy, buy it.)
The Living World of FaeryPower Within the Land: The Roots of Celtic and Underworld Traditions Awakening the Sleepers and Regenerating the Earth (Celtic Myth and Legend, Vol. 2)Earth Light: The Ancient Path to Transformation Rediscovering the Wisdom of Celtic & Faery Lore (Celtic Myth & Legend)
The Living World of Faery
by R. J. Stewart

If you can find a copy of this book, it's a good place to begin your studies.
Power Within the Land: The Roots of Celtic ...
by R. J. Stewart
Earth Light: The Ancient Path to Transforma...
by R. J. Stewart
The Underworld Initiation: A Journey Towards Psychic TransformationPower Within the Land: Roots of Celtic and Underworld Traditions Awakening the Sleepers and Regenerating the Earth (Earth Quest Series)Advanced Magical Arts: Visualisation, Mediation and Ritual in the Western Magical Tradition
The Underworld Initiation: A Journey Toward...
by R. J. Stewart
Power Within the Land: Roots of Celtic and ...
by R. J. Stewart
Advanced Magical Arts: Visualisation, Media...
by R. J. Stewart
Living Magical Arts
Living Magical Arts
by R.J. Stewart