Definitely not ones written by Gary Keller or Robert Kiyosaki.

The E-myth Revisited by Michael E. Gerber

Ninja Selling by Larry Kendall

Taking Care of Business by Brian Buffini & Joe Niego

The Greatest Salesman in the World 1 & 2 by Og Mandino

The Richest Man in Babylon by Geoarge Clason

The Referral of A Lifetime by Tim Templeton

...so many more, but those alone could run a business.

It is worth mentioning that all books contribute meaning, growth and pondering. Now, as to furthering one's journey into a specific forum such as Real Estate, functional subject books like contracts, human nature (vast & relevant), floorplans, construction, roofing may add educational values.  Mind you, stay away from hype, dreamer books, and get rich quick stuff as it cheapens and takes away. Lastly, not everything meaningful comes from thoughts and feelings but from the heart. Seek heart-driven guidance.

who moved my cheese

The Secrets of Question-Based Selling

Never Split the Difference

Millionaire Real Estate Agent

1. Endless Referrals by Bob Burg

2. The Power of Full Engagement by Jim Loehr and Tony Schwartz

I do not have any specific books to recommend for Realtors to read. Heavens there are so many. My garage if filled with boxes and boxes of books. I wish you all the best with your office book club. 

The Four Agreements - Don Miguel Ruiz
Psycho Cybernetics - Maxwell Maltz
Brokers Who Dominate - Rod Santomassimo
Now Is Your Time To Win - Dave Dean

The Millionaire Real Estate Agent - because it is a Model for creating a cash flowing Real Estate Business 

Another would be Zig Ziglar’s “ See You at the Top” - a Positive Timeless Classic

Think and grow rich

Any books by Robert Schuller

Millionaire agents.

"Who Moved My Cheese" Spenser Johnson M.D.

"See You At The Top" Zig Zigler

"Use What You've Got" Barbara Corcoran

MREA

The One Thing

Shift

MREI

along with thousands of other non kw books that make professionals shine.

Pat The Bunny

Blueberries For Sal

Donald Duck Goes To Harlem.

These will keep the new agent who is licensed but does not know how to fly grounded. And to never forget folks with families, people of all types, needs and price points are involved. It's not Herb Tarlek selling yourself wearing plaid. It's being empathetic and matchmaking, feeling, listening to the needs of your buyers and sellers.

That's a nice idea, Lisa! Sorry, I don't have anything in mind off hand. Maybe you could start with  articles and graduate to books. Please share if you get a good list!

Who do you associate with as your guru. So many out there with twists ad turns that make them popular for some and a nemesis for others. Poll your associates.

Ninja Selling by Larry Kendall

You(2) by Price Pritchett

The Servant Leader's Manifesto by Omar L. Harris

Think and Grow Rich by Napoleon Hill

The Surrender Experiment by Michael A. Singer

"Your Successful Real Estate Career" and "21 Things I wish my Broker had Told Me".  

It's Just my Nature by Carol Tuttle is a good one. It helps to figure out what energy type you are. I am facilitating a Book Club on this book the end of this month for my women's networking group. We studied it before a few years ago. Several requested we do it again.   

Average Sucks

Winning

Surrounded by Idiots

Make Big Happen

Some aggressive titles there but I promise there's good & kind content. 

21 Things I Wish My Broker Had Told Me

My Personal Best by John Wooden

Checking other answers, I'm in complete agreement with Thomas J. Nelson, REALTOR ® e-Pro CRS RCS-D Vets and to his list I would add, Millionaire Real Estate Agent.

I recommend this to every agent in NYC: 

New York Co-op Bible: Everything You Need to Know About Co-ops and Condos: Getting In, Staying In, Surviving, Thriving