Information I have read that has helped me undestand photography, stock photography and even illustration and art more because they help me to look at visual communication in so many more ways. These books I have bought and read have really helped me to appreciate the depth and scope of the visual arts.  And, even opened my eyes and ears to video and audio stock. For these books I'm thankful.
I will give a brief explanation of each book from my perspective. And, include other books I haven't read yet but look interesting.

Starting off with a classic favorite that has been expanded upon and revised.

"The New Drawing on the Right Side of the Brain" by Betty Edwards.
This is one of the first books I ever read on art when I was about 14, about 30 years ago.
It really helped me slow down and really look at what I was drawing.
One of the lessons I'm pretty sure I learned from this book was to look at the drawing in a different perspective. For example, if you were drawing a landscape look at it in a portrait mode and see if your lines are still straight or where you want them to be. Even look upside down when possible. Look again from a different angle. Are your lines still in alignment? It was something like that.
Drawing can also take you into an almost or meditative state that can make time take on a realization of the present as you flow with each line you create.
This book can really help you learn this and more. It's something that stays with you for a long time, 30+ years for me.
The size of the book is just right for using the book open as you can flatten the pages to lay mostly flat easily from what I remember.
Writing is easy to read and understand. A friendly tone.
There are examples and instruction.

The expanded upon and revised edition I haven't read yet but it is at the top of my list.
Product description says it's a newer version that includes brain research, new ways to communicate in business and education, more color information, translating drawing skills to help solve other problems and more.

Apparently since I've read the old version of the book it has been translated into 13 languages and has been bought over two and a half million times. She has been teaching through hundreds of seminars and workshops.
It was first published in 1979. "Drawing on the Right Side of the Brain" appeared on the New York Times Best Seller List for over a year from within two weeks of going on sale.

There's even a work book that goes along with it.

I highly recommend it.

Books below include:

The New Drawing on the Right Side of the Brain: A Course in Enhancing Creativity and Artistic Confidence [Hardcover]

The New Drawing On The Right Side Of The Brain - A Course In Enhancing Creativity And Artisitic Confidence [Paperback]

Drawing on the Right Side of the Brain [Paperback]

Other books by Betty Edwards PhD that look interesting include:

New Drawing on the Right Side of the Brain Workbook: Guided Practice in the Five Basic Skills of Drawing [Spiral-bound]

Color by Betty Edwards: A Course in Mastering the Art of Mixing Colors [Paperback]

Drawing on the Artist Within: An Inspirational and Practical Guide to Increasing Your Creative Powers [Paperback]

FAVORITE PHOTOGRAPHY RELATED BOOKS

MICROSTOCK MONEYSHOTS, Turning Downloads into Dollars with MicrostockPhotography, ELLEN BOUGHN WITH A FORWARD BY ANDRES RODRIGUEZ


INSPIRED PHOTOGRAPHY, 189 Sources of Inspiration for Better Photos, The Editors of PHOTOPRENEUR


99 Ways to Make Money from Your Photos, from the editors of PHOTOPRENEUR
One of my favorite books for the large variety of ideas and references to places online and off about where to list and sell your art, photography, crafts, and more.
Each of the 99 ideas is a few pages long and includes great insight into details from real life experience of all the marketing avenues for your creations and information about how to get you started. Also, a summary and ways to get started for each one.
Easy to read and understand.
Book and Kindle Edition.


Kindle readers


Taking STOCK, Make money in Microstock creating photos that sell, Rob Sylvan, Book and Kindle Edition


LEARNING TO SEE CREATIVELY, REVISED EDITION; Design, Color and Composition in Photography, BRYAN PETERSON, Book and Kindle Edition


Mastering Digital Flash Photography, The Complete Reference Guide, Chris George, Book


Digital SLR Pro Secrets, David D. Busch, Book and Kindle



BIG BUCKS SELLING YOUR PHOTOGRAPHY, A Complete Photo Business Package for All Photographers, CLIFF HOLLENBECK, Book and Kindle


HOW TO SUCCEED IN COMMERCIAL PHOTOGRAPHY, Insights from a Leading Consultant, SELINA MAITREYA, Book and Kindle


Microstock PHOTOGRAPHY, How to MAKE MONEY from Your DIGITAL IMAGES, DOUGLAS FREER, Book and Kindle Editions


The DAM Book, Digital Asset Management for Photographers, Peter Krogh


Digital Stock Photography, How to Shoot and Sell, Michael Heron


Canon EOS Rebel T2i/550D, From Snapshots to Great Shots, Jeff Revell, Book and Kindle Editions


Canon EOS Rebel T2i/550D Digital Field Guide, Charlotte K. Lowrie, Book and Kindle Edition


Other Photography Books and  Related Products that Look Interesting to me.