Some of the authors I have read and recommend:

Joseph Campbell - The hero with a thousand faces

Antero Alli - Angel Tech

Jeremy Narby - The cosmic serpent

Eckhart Tolle - The Power of Now

Ken Wilber - No Boundary

Mircea Eliade - Shamanism "Archaic Techniques of ecstasy"

Robert Johnson - Inner Gold

Erich Fromm - Man for Himself

Peter Carey - Return of the Bird Tribes

Miyamoto Musashi - The Book of 5 Rings

Jung - Synchronicity

Stephen Wangh - An Acrobat of the heart

Partick Harpur - Daimonic Reality

Alain De Botton - The consolations of philosophy

Robert Greene - Mastery

Swami Satyananda Saraswati - Meditations from the tantras

Evelyn Underhill - Practical Mysticism

Penguin - The Essential Rumi

The upanishads

The Bhagavad Gita

Jennifer Biddle - Breasts, Bodies, Canvas