The Illumined Mind
Ananda Devi and Premananda Deva

The Bhagavad Gita
Sri Aurobindo

The Mother
Sri Aurobindo

Cosmic Consciousness
Richard Maurice Bucke

Ramana Maharishi and the Path of Self-Knowledge
Aurthur Osbourne

The Masters and the Path
C.W. Leadbeater

The Autobiography of a Yogi
Paramahansa Yogananda

The Women's Encyclopedia of Myths and Secrets
Barbara Walker

The Synthesis of Yoga
Sri Aurobindo

Tibets' Great Yoga Milarepa
Evans Wentz

The Hindu Way of Life
Dr. Rhadakrishnan 

Plotinus

Plato

Lao Tzu