A key to great marketing and sales is to never stop learning. Use these books to improve yourself and improve your knowledge of marketing and sales:

The Art of the Start by Guy Kawasaki

The Copy Workshop Workbook 2002 by Bruce Bendinger

Crucial Conversations by Kerry Patterson

Counterintuitive Marketing by Kevin J. Clancy

The Greatest Salesman in the World by Og Mandino

How Customers Think by Gerald Zaltman

Indispensable by Joe Calloway

How to Win Friends and Influence People by Dale Carnegie

Ogilvy on Advertising by David Ogilvy

The Power of Positive Thinking by Norman Vincent Peale

Priceless by Diana Lasalle and Terry A. Britton

Principle-Centered Leadership by Stephen R. Covey

The 7 Habits of Highly Effective People by Stephen R. Covey

SPIN Selling by Neil Rackham

The SPIN Selling Fieldbook by Neil Rackham

Think And Grow Rich! by Napoleon Hill

Why We Buy by Paco Underhill