There aren’t many books dedicated solely to teaching you how to ask for money. That’s why I’m writing one! But since mine won’t be ready for a few more months, be sure to check out Asking: A 59-Minute Guide to Everything Board Members, Volunteers, and Staff Must Know to Secure the Gift by Jerry Panas. Though priced at an expensive $24.95, the 112 page Asking is very readable and filled with great advice.
You can get it on Amazon at:
http://www.amazon.com/exec/obidos/ASIN/1889102172/marcpitmancom (my affiliate link)
or
http://www.amazon.com/exec/obidos/ASIN/1889102172/ (a normal link)