Reddit mentions of Ellsworth on Woodturning: How a Master Creates Bowls, Pots, and Vessels (Fox Chapel Publishing) Over 400 Photos, Step-by-Step Directions, Techniques, Expert Tips, and Troubleshooting for Your Lathe

If you're looking for a solid foundation in technique, pick one or the other of:

Woodturning ,A Foundation Course- Keith Rowley

or, Fundamentals of Woodturning, Mike Darlow

For more artistic/ inspirational instruction, I'd recommend the following, and I'll just be lazy and copy my text from the wiki here (I'd argue that even in this day and age of YouTube etc, these two have a very relevant place on every bowl turner's bookshelf):

Ellsworth on Woodturning: How a Master Creates Bowls, Pots and Vessels, David Ellsworth, 2008: A must read for all turners really (but especially those interested in green wood bowl and vessel turning), this comprehensive guide from the grandfather of the modern art woodturning movement covers everything from making your own hollowing tools, to using the bowl gouge, to sanding and finishing and everything in between.

The Art of Turned Bowls: Designing Spectacular Bowls with a World- Class Turner, Richard Raffan, 2008: Anything by Richard Raffan is worth reading but this book is especially useful, because, while there are lots of technical turning manuals and "how-to" material available, there is comparatively little written about good form and design, and it is a concept many woodturners would do well to pay more attention to. Good form trumps pretty wood, and this book shows you how one master developed his eye for pleasing curves and good proportion through a lifetime of production bowl turning while reflecting on what made some shapes more successful than others.

I highly recommend Ellsworth's book. He shares all of his techniques, from hollow forms, tool making, and spalting.

http://www.amazon.com/Ellsworth-Woodturning-Master-Creates-Vessels/dp/1565233778/ref=sr_1_1?ie=UTF8&qid=1376349061&sr=8-1&keywords=david+ellsworth

https://www.amazon.com/Ellsworth-Woodturning-Master-Creates-Vessels/dp/1565233778

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