my first quilting reference book and one I still use a lot is "Quilting --- the Complete Guide" by Darlene Zimmerman.
This book was recommended by the best teacher at my LQS. She taught my Intro to Quilting class. The book is easy to follow, simple directions for all kinds of things. It is small -- 8x7 inches, hard cover with an internal spiral binding so it stays open. I can tuck it into my sewing machine bag if I want to take it with me.