The Elements of Style, 4th ed. by William Strunk, Jr. and E.B. White A concise review with examples of the principles of usage and composition, as well as writing tips.
Word Painting, The Fine Art of Writing Descriptively, Revised Edition by Rebecca McClanahan
Language Making Nature, A Handbook for Writers, Artists, and Thinkers by David Lukas
Wired for Story, The Writers’ Guide to Using Brain Science to Hook Readers from the Very First Sentence by Lisa Cron
Self-Editing for Fiction Writers, How to Edit Yourself into Print, 2nd Ed. by Renni Browne & Dave King
Descriptions and examples of literary devices: Literary Devices
Examples of metaphors in literature and pop culture: Examples of metaphors
The Emotion Thesaurus: A Writer’s Guide to Character Expression by Angela Ackerman & Becca Puglisi, 2012 I have found this book to be invaluable for showing rather than telling how a character feels. It’s a handy guide to emotions and the associated body language.