Must-Read Books for Writers

In no particular order or preferential ranking

General Writing
The Complete Handbook of Novel Writing by the Editors of Writers Digest
The Breakout Novelist by Donald Maass Crafting Novels & Short Stories by the Editors of Writers Digest
Novel Shortcuts by Laura Whitcomb 
90 Days to Your Novel by Sarah Domet Writing YA Fiction for Dummies by Deborah Halverson Revision and Self-Editing for Publication by James Scott Bell Writing the Paranormal Novel by Steven Harper Writing the Bestseller: Romantic and Commercial Fiction by Jane Porter and Rebecca Lyles The Nighttime Novelist by Joseph Bates The Kick-Ass Writer by Chuck Wendig (check out his awesome blog, Terrible Minds)
And strictly for Self-Publishers...
The Indie Author Guide by April L. Hamilton
The Complete Guide to Self-Publishing by Marilyn Ross and Sue Collier
Self-Publishing for Dummies by Jason R. Rich Publishing E-Books for Dummies by Ali Luke APE: Author, Publisher, Entrepreneur by Guy Kawasaki and Shawn Welch The Naked Truth About Self-Publishing by 10 NYT Bestselling Authors
And just because this APE video is too cute not to share: