One other thing, the list of books in the lower portion of our sidebar, the
recommended reading link, will take you to a page of books *all of which* have been read and recommended by other members. That may be a good place to start looking.
One thing to note is that the majority of the books listed aren't necessarily 'VA' books - many are just small business, entrepreneurial type books, some are about marketing, some are about developing a referral-based practice, some are about tax laws, etc. The books by Dianna Ennen - Virtual Assistant, The Series (the top left listing on that page) are a set (workbook and textbook) that I'm actually reading now, it's a nice, simple breakdown of what one could do to get a VA practice started up and provides worksheets, etc.