First Break all the Rules is the foundation for the research associated with Strengthsfinder. A Gallup product that I believe is more accurate and detailed in terms of determining who you are and how you should change or utilize the strengths, talents and skills you have. I have almost all of the books provided in this area. Some are good and some not so good but this is really the one to read if you want the history, research and foundation for the use of Strengthsfinder in your professional and personal life.
I have the hard copy and Kindle copy because I lost my sight in 2008 in one eye. I am challenged in the other eye but functional. I am a tremendous fan of Kindle and could not really function without it.
Enjoy your new foundation about yourself.