Archetypes of the Zodial, by Kathleen Burt (ISBM 0-87542-088-5)
A Spiritual Approach to Astrology, by Myrna Loftus (ISBN 0-916360-10-5)
Horoscope Symbols, by Robert Hand (ISBN 0-914918-16-8)
Pluto, The Evolutionary Journey of the Soul; Vol I & II, Jeff Green. Llewellyn Publications (ISBN 0-87542-269-9).