- The Emotion Thesaurus: A Writer's Guide to Character Expression - Book by Angela Ackerman and Becca Puglisi. There are several books in these series, and all are useful.
- Writing the Breakout Novel - Donald Maas - A good insight, although a bit out of date in certain areas regarding the e-book scene
- Stein on writing - Sol Stein
- Plot & Structure: Techniques and Exercises for Crafting a Plot that Grips Readers from Start to Finish. Actually, I have all of Bell's books. They are all good.
- Self-editing for Fiction Writers - Book by Dave King and Renni Browne[/li][/list]
- Writing Fiction for Dummies - Novel by Peter Economy and Randall Ingermanson. Too much Orson Card love here, but it is still a very good book.
- Platform: Get Noticed in a Noisy World - Michael Hyatt. Good for reminding oneself the marketing tricks. A bit blog focused, but still very useful.
- Write, Publish, Repeat: The No Luck Required Guide to Self-Publishing Success - Book by David E. Wright, Johnny B. Truant, and Sean Platt
- Master Lists for Writers: Book I, Knights of Manus Sancti - Book by Bryn Donovan. The indexing is bad, but it is a very useful resource.
- Creating Character Arcs: The Masterful Author's Guide to Uniting Story Structure, Plot,... Book by K. M. Weiland
- Do the Work - Book by Steven Pressfield
These are the ones I've read that I found useful, and returning for reference. I hope they help.