Sometimes, Barnes and Noble is better than the library
Ladies Who Launch (http://www.ladieswholaunch.com
) by Victoria Colligan, Beth Schoenfeldt, and Amy Swift
The book is about fostering and releasing entrepreneurial spirit in a non-traditional, non-linear approach. The website is like one big discussion group for ideas, services, networking, etc.
Retail in Detail by Ronald L. Bond
The author and his wife write about their own experiences in the general retail business. He gives a lot of practical advice, but the text is very dense.
The Crafts Business Answer Book by Barbara Brabec
If you have a specific question about the general craft venture, this book might come in handy. I didn't see anything knitting-related, though.