Complete Calligraphy Skills by Vivien Lunniss is well written with sections on calligrapher's tools, work surfaces, understanding letters and layout and design. The book covers 20 lettering styles with a brief history and examples of each. The one thing that really attracted me to this book is when I looked at it at my local Barnes & Noble book store, was in addition to the normal numbering of the strokes she color coded the strokes too. For someone who is very visual that's a real help. Plus, for each letter style you can either scan a QR code or type in the URL for an online tutorial.
Link to Amazon: