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In page Ann Shulgin:

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Together with her husband she authored the books PiHKAL and TiHKAL.[4] They developed a systematic way of ranking the effects of the various drugs, known as the Shulgin Rating Scale, with a vocabulary to describe the visual, auditory and physical sensations. She also contributed to the books Thanatos to Eros: 35 Years of Psychedelic Exploration, Entheogens and the Future of Religion, Ecstasy: The Complete Guide, The Secret Chief Revealed, Higher Wisdom: Eminent Elders Explore the Continuing Impact of Psychedelics, and Manifesting Minds: A Review of Psychedelics in Science, Medicine, Sex, and Spirituality.[citation needed]