What is the best graphic design book that you have ever read?

In my opinion the best graphic design book is "The Complete Graphic Designer" written by "Ryan Hembree".
I am sure you would find it very useful that cover all topics related to Graphic Designing.

For me It is pen and paper.

The best design book I've read is Sun Tsu's The Art of War.
Not quite a design book until you translate it's teachings and apply it to design.
For example, there's a lesson on using your environment to your advantage.
When designing a logo, you must anticipate where and what medium or media it will appear in.
Knowing that, you can decide accordingly.
Another is "when you are strong, feign weakness; when you are weak, appear strong." Depending on the company, a small company may need a logo with more impact (almost over-kill) just to separate itself from the competition, while a huge brand may need a more subtle logo to allow it the versatility to be applied to future corporate endeavors.

i suggest don't read a book about graphic design, i will affect you and how you will become as a graphic designer.
write your own journal about the things you created from scratch, that's the best book you can ever had in graphic designing.
You will become a designer on your own right.
because all the books you gonna read are journals of an artist.

yes, The Elements of Typographic Style

My Best Ever Book on Learning Designing in Short time of duration with proficient way. 

First my best friend Google,

Second my girlfriend YouTube.

From this two friends I learn for free they help me a lot.:P

in my opinion the best graphic design book adobe photoshop tutorial

http://designeriz.com/  Check it out.

Logo and branding books 02. Branding: In Five and a Half Steps The

" How to be a graphic designer without losing your soul" by Adrian Shaughnessy

I highly recommend

not neccesarily books but those design collections from rockport publications.

can be really good sources of inspiration