Here are books I have reviewed before up on my blog.
Archangels 101 by Doreen Virtue
The Encyclopedia of Angels, Spirit Guides, & Ascended Masters: A Guide to 200 Celestial Beings to Help, Heal, and Assist You in Everyday Life by Susan Gregg
A Book of Angels by Sylvia Browne
Signs from Above by Doreen Virtue and Charles Virtue
A Comprehensive Guide to Angel Therapy by Denise Whichello Brown