Useful Books About Self Publishing

Here are a few books I've found useful so far;

1. Plug Your Book - Lots of ideas a lot of which are centered around Amazon.
2. Sell Your Book on Amazon - I thought this book would be chatty but actually contains a lot of really hard "how to" sections to help promote your book in Amazon.
3. The Magic of Big Thinking - This isn't actually about self publishing but a very enjoyable and interesting book especially if you're looking at the long term to sell books and grow your self publishing business.