There are a lot of differing opinions on this subject. We feel this is valuable and we encourage breadth as well as depth while investigating this fascinating subject. No one has all the answers.
(please note: we have no financial interest in promoting the following books)
Rev. Michael J. S. Carter – Initiation: The Spiritual Transformation of the Experiencer A Guide for Contact Experiencers; This book focuses more on alien visitation from the perspective of a long-time contactee.
Jim Willis – Hidden History: Ancient Aliens and the Suppressed Origins of Civilization; This book takes several paces back to look at the big picture, including physics, mythology, religion, and how they might just all fit together.
Jamie Lance – The Coming ; This book appears to approach the subject from an angels and demons perspective.
Xaviant Haze – Ancient Aliens in the Bible; Another interesting take on the subject.