There are some books about how to manage the sales teams in the Gallup Management Journal. (http://gmj.gallup.com/BookCenter/default.aspx)

Most of these books are written for the sales management teams, rather than for the sales represetatives. If you are a sales manager, it is likely that you could find some books that could help you to manage your sales team, and improve the sales outcome of your sales team.

Secrets of closing sales / Roy Alexander and Charles Roth.

This book shows quite some methods to closing your sales, although some people feel these methods are outdated.

There is also another book in the same title via Zig Ziglar.

there are 4 feedback in amzaon. All of them are 5 stars. I have not read this book, but this might be a book worth your time.

It is not hard to find a book regarding telephone sales, but in order to find a helpful and useful book that worth your time might be not too easy.

Here is how I found this book, I search in Amazon for Telephone Sales, and then I sorts the result by the customer review. Here is what I found:

Telesales Tips From The Trenches: Secrets of a Street-Smart Salesman - by Joe Catal

If you are planning to start your Outside Sales jobs,
this might be a book that could be useful to you.

Your Sales Career Strategy: An Insider's Guide To Those Considering a Career in Outside Sales - by Christopher Gilmore

If you want to learn more about how to do an excellent sales presentation, and you are new to the sales job, this book could be help. It seems that new sales people like it, while the sales people with years experience do not feel it is too helpful.

New sales speak : the 9 biggest sales presentation mistakes and how to avoid them / Terri L. Sjodin.
Sjodin, Terri L.
Hoboken, N.J. : Wiley, c2006.

The title of this book attract my attention, most of us love a million dollar a year sales income, right?

Sales management demystified : a self-teaching guide / Robert J. Calvin.
Calvin, Robert J.
New York : McGraw-Hill, c2007.

Masters of sales : secrets from top sales professionals that will transform you into a world class s
Misner, Ivan R., 1956-
[Irvine, CA] : Entrepreneur Press, c2007.

The four kinds of sales people : how and why they excel--and how you can too / Chuck Mache.
Mache, Chuck, 1957-
Hoboken, N.J. : John Wiley, c2007.

The ultimate sales machine : turbocharge your business with relentless focus on 12 key strategies /
Holmes, Chet.
New York : Portfolio, 2007.