On the shelf
As with any subject matter that is popular the world over, karate has been written about in enough articles, magazines, and books to fill a library all of it's own.
Over the years I have aquired more than my fair share of these publications and books, many of which I am sure you might also own, or at least would be some what familiar with.
The titles listed below are amongst my personal favorites and while not all of them are on the subject of Shotokan Karate, never the less for a wide variety of reasons, I feel that they deserve to be brought to the attention of as many karate-ka as possible.
I consider all of these books, or magazines, worth the expense, and they are all most certainly well worth your time.
The Warrior's Path
The Twenty Guiding
Principles of Karate

Karate Fighting Techniques by Hirokazu Kanazawa

All great leaders were great readers.
Part the clouds - see the way.
"The objective of karate-do is to contribute to the evolution
of the human spirit through physical and mental training."
Sensei Peter Lindsay