A particular favorite of mine is:
A Field Guide to Demons 'Fairies, Fallen Angels and Subversive Spirits' by Carol K. Mack & Dinah Mack
I know of no others I would recommend right now. So many...
Bratman, Steven and David Kroll. Natural Health Bible. Prima Publishing, 1999. Feinstein, Alice. Prevention's Healing with Vitamins. Pennsylvania: Rodale Press, 1996.