These are the best books to learn sales to further your own success. It is my own personal list and I believe it is up to you that you continue applying the principles stated in said books.
Pitch Anything by Oren Klaff
Spin Selling by Neil Rackham
How to Win Friends & Influence People by Dale Carnegie
You Can Negotiate Anything by Herb Cohen
Influence, New and Expanded: The Psychology of Persuasion by Robert Cialdini