I wondered whether whoever had books to recommend for the supplementation to learn each small thing there must know to play operation behind, linebacker and/or safety?
Moreover, books on which type of the plays which adapted the best in certain situations like a general football 101 or of something would be large too.
There is only so much one can learn from the practice and operation the plays, I want to add to my play and to treat it like a study all the times that I had the hour to read my serviceable time.