breakthrough-advertising

Breakthrough Advertising by Eugene M. Schwartz.A book about advertising and how it can help increasing your sales.
spin-selling

SPIN Selling by Neil Rackham. his book explains about consultative selling that can be helpful to businesses.
the-ultimate-sales-machine-turbocharge-your-business-with-relentless-focus-on-12-key-strategies

Ultimate Sales Machine by Chet Holmes. A guide for people who wants to improve their business. The author provide some strategies that can help your business to stay on top.