Well, that book was the one that introduced me to a lot of techniques and practicing metal and speed so that's a good one I think.
There are lots of books depending on the area you want to cover.
For example, for philosophical matter you can read T.W. Adorno, Philosophy of the new music is a good one.
Jazz theory by Mark Levine is good to know everything you need to know about basic, intermediate and some advance theory.
Then for music forms you have a good one about the Sonata Form by Charles Rosen called "The Sonata Form".
For improvisation you can use some pattern books like the one by Oliver Nelson called just simply "Patterns: and aid for improvisation".
Then in that subject you have all the Jerry Bergonzi books and for guitar specifically are the Jody Fisher series.
Also good ones with backing tracks and everything are the Aebersold books (there are 106 volumes).
Pat Martino has a nice book about how to improvise over everything with only minor 5 patterns, that's a nice book and method.
I don't know...I could kkep mentioning more but you have to askme more specifically about a topic