Translation of the Yoga Sutras by Chip Hartranft
Translation of the Mandukya Sutra by Swami Krishnananda
The Mandukya Upanishad is entirely devoted to explaining OM. The Mandukya is generally acknowledged as the most important Upanishad and is believed to contain all that is needed to attain Self-realization.
Translation of the Hatha Yoga Pradipika
A primary sutra for Hatha Yoga. Written by Swami Swatmarama, in approximately the 1400s. Emphasizes Yoga postures, energetic breathing exercises, and the chakra system.
Translation the Description of the Six Chakras by Arthur Avalon
The first known written description of the chakra system is in the Sat-Cakra-Nirupana (Description of the Six Chakras), written by Purnananda-Swami in 1526. In 1919, Sir John Woodroffe translated this text in his book The Serpent Power (under the alias Arthur Avalon), which became the basis for the chakra system popularized in contemporary Western Yoga.
Translation of the Shiva Sutras by Jaideva Singh (1979)
The Shiva Sutras is Tantra Yoga’s primary scripture. It describes Self-realization as an experience of being unified with God consciousness, as it exists in the form of the Universe.
Way of Zen: by Alan Watts (1957)
The Way of Zen guides the reader through the histories of Buddhism and Taoism, which provide the foundation for the development of Zen Buddhism. It paints a broad but insightful picture of Zen. Watts's narrative is a thorough scholarly presentation. The Way of Zen is an excellent introductory book on Zen.
Zen Mind, Beginner's Mind: by Shunryu Suzuki (1970)
Written by Shunryu Suzuki, a respected Zen master in Japan and founder of the San Francisco Zen Center. This is a non-academic book, a compilation of talks that address the basics of Zen, such as posture, breathing, and the philosophy of non-duality. The writing is very clear and inspirational. "In the beginner's mind there are many possibilities, but in the expert's there are few."
Excellent short reading from the first page of Zen Mind, Beginner's Mind. Read by Peter Coyote. Only 3 minutes
Brief overview of Zen Buddhism by Alan Watts. Only 12 minutes