You will know if there is any kind of truth in the book as you will feel it in your gut, your instinct will guide you. Trust in it.
There are several books that I have found to be invaluable. Below is a list of the books that I have in my pocession. The first ones are the better ones, and the others are good for one reason or another.
Just remember, these are the ones that I have found that work for me; they may work for you, they may not. Just keep looking and growing!
Green Witchcraft I,II, III by Ann Moura
The Sabbats by Edain McCoy
Moon Magick by D.J. Conway
Love is in The Earth - A Kaleidoscope of Crystals by Melody
Zodiac Experience by Patricia Crowther
Moon Sign Book by Llewellyn
To Ride A Silver Broomstick by Silver Ravenwolf
To Stir a Magick Cauldron by Silver Ravenwolf
To Light A Sacred Flame by Silver Ravenwolf
Dancing With Dragons by D.J. Conway
Animal Speak by Ted Andrews
The Only Astroloty Book You'll Ever Need
by Joanna Martine Woolfolk
The Tenth Insight by James Redfield
The Celestine Prophecy An Experiential Guide
by James Redfield and Carol Adrienne