- Arnold, Sir Edwin The Song Celestial or Bhagavad Gita (TPH Wheaton 1970)
- Besant, Annie & Bhagavan Das The Bhagavad Gita (TPH Adyar)
- Besant, Annie Esoteric Christianity: or, the Lesser Mysteries (TPH 1901/2006)
- Besant, Annie Seven Great Religions (TPH 1970)
- His Holiness the Dalai Lama The Opening of the Wisdom-Eye (TPH Adyar)
- Das, Bhagavan The Essential Unity of All Religions (TPH 1946)
- Douglas-Klotz, Neil The Hidden Gospel: Decoding the Spiritual Message Of the Aramaic Jesus (Quest 2001)
- Douglas-Klotz, Neil The Genesis Meditations: A Shared Practice of Peace for Christians, Jews and Muslins (Quest 2003)
- Feuerstein, Georg Introduction to the Bhagavad Gita its Philosophy and Cultural Setting (Rider 1974/ TPH 1983)
- Govinda, Anagarika The Way of the White Clouds (Overlook Press 2006)
- Hixon, Lex Heart of the Koran (TPH 1988)
- Hodson, Geoffrey From Nativity to Ascension (TPH 1983)
- Hodson, Geoffrey The Hidden Wisdom in the Holy Bible (5 volumes) (TPH 1963/1980)
- Humphreys, Christmas Exploring Buddhism (Unwin 1974/1980)
- Humphreys, Christmas A Western Approach to Zen: An Enquiry (TPH 1972)
- Humphreys, Christmas Zen Buddhism (Macmillan 1970)
- Knoche, Grace F. Theosophy in the Qabbalah (Theosophical University Press 2006)
- Kuhn, Alvin Boyd A Rebirth for Christianity (Quest 2005)
- Lao Tzu The Tao Te Ching (Various translations available)
- Legge, James (Translation) The Sacred Books of China: The Texts of Taoism (Dover 1962)
- Mehta , Phiroz, The Heart of Religion (Element Books 1976)
- Muller, Max (Translation) Wisdom of the Buddha: The Unabridged Dhammapada (Dover 2000)
- Murphy, S. Upside-Down Zen a direct path into reality (Lothian 2004)
- Nhat Hanh, T. The Miracle of Mindfulness: A manual on meditation (Rider 1975/1994)
- Nhat Hanh, T. Cultivating the Mind of Love.The practice of looking deeply in the Mahayana Buddhist tradition (Parallax Press 1996)
- Olcott, Henry S. The Buddhist Catechism (TPH 1904/2008)
- Prabhavananda, Swami & Christopher Isherwood The Song of God (New American Library 1954)
- Radhakrishnan, Sarvepalli The Principal Upanisads (Oxford University Press 1953/1990)
- Radhakrishnan, S. and C. A. Moore A Source Book In Indian Philosophy (Princeton University Press 1957)
- Schuon, F. The Transcendent Unity of Religions (TPH 1984)
- Spierenburg, H.J.(Ed.) The Buddhism of H.P. Blavatsky (Point Loma Publications 1991)
- Spierenburg, H.J.(Ed.) The New Testament Commentaries of H.P. Blavatsky (Point Loma Publications 1987)
- Spierenburg, H.J.(Ed.) The Vedanta Commentaries of H.P. Blavatsky (Point Loma Publications 1992)
- Spong, John Shelby Rescuing The Bible From Fundamentalism (Harper 1991)
- Spong, John Shelby Jesus for the Non-Religious: Recovering the Divine at the Heart of the Human (Harper Collins 2007)
- Suzuki, D. T. Outlines of Mahayana Buddhism ( Schocken Books 1907/1973)
- Suzuki, D. T. The Zen Doctrine of No-Mind (Samuel Weiser Inc.1949/1977)
- Suzuki, D. T. The Awakening of Zen (Prajna Press 1980)
- Thurman, Robert A.F. Anger: The Seven Deadly Sins (Oxford University Press 2005)
- Venkatesananda, Swami The Concise Yoga Vâsistha (SUNY Press 1984)
- Waley, Arthur The Tao and its Power: A Study of the Tao te Ching and its Place in Chinese Thought (Grove Press 1958)
- Williams, Jay Judaism (TPH 1980)
