Bible, Qur'an and Science (The), Dr Maurice Bucaille. 2002 (original 1976), ISBN 1930637217
Conversations With God (books 1,2 and 3) and subsequent publications, Neale Donald Walsch.
From Science to God, Peter Russell, ISBN 1577314093
Gnostics (The), Tobias Churton, George Weidenfeld & Nicolson Limited 1987, ISBN 0297791060
Gnostic Gospels (The), Elaine Pagels, Vintage Books, 1989 (original 1979), ISBN 0679724532
Gospel of Relativity (The), Walter Starcke, Turnstone Books 1974, ISBN 0855000376
Greater Than You Know, Peter Phipps, Sathya Sai Publications of New Zealand 1997, ISBN 095833384X
Jesus and The Goddess, Timothy Freke and Peter Gandy, Harper Collins 2001, ISBN 000710071X
Jesus the Man, Barbara Thiering, Corgi Books 1993 and 1996, ISBN 0552139505
Jesus the Master Builder, Gordon Strachan, Floris Books 1998 and 1999, ISBN 0863152759.
Jesus Prophet of Islam, Ahmad Thomson and another, Ta-Ha Publishers Ltd 1996, ISBN 189794053X
Magi, The Quest for a Secret Tradition, Adrian G. Gilbert, 1996.
Marriage of East and West (The), Bede Griffiths, Fount Paperbacks 1983 and 1985, ISBN 0872431053
Message That Comes From Everywhere (The), Gary L. Beckwith, The Harmony Institute 2001, ISBN 0970112564
Sufis (The), Idries Shah, Anchor 1971, ISBN 0385079664
World's Religions (The), (various contributors), Lion Publishing 1988, ISBN 0867609850