There are just two books I know on selling and they are both hard to find:

"Dynamic Selling" by S. Robert Trailins

And "The Sales Advantage" By The Dale Carnegie Group

The tell you so many things

How to Get clients
Leverage
Referrals
How to determine customers need
How to Reach the decison makers
Determine buying motives
Handling Objects
How to Sell Beyond the quesions of price

I have book and audios for the Dale Carnegie ones, I order the book.

Books have a lot more information the two audios.