Addonzio, Kim and Dorianne Laux: The Poet’s Commpanion: A Guide to the Pleasures of Writing Poetry.

Addonizio, Kim: Ordinary Genius: A Guide for the Poet Within.

Behn, Robin and Chase Twitchell, eds: The Practice of Poetry: Writing Exercises from Poets Who Teach.

Bernays, Anne and Pamela Painter. What If? Writing Exercises for Fiction Writers, 3rd Edition. 

Blythe, Will, Ed. Why I Write: Thoughts on the Craft of Fiction.

Gerard, Philip, Ed. Writing Creative Nonfiction. (Not positive the link is right.)

Gerard, Philip, ed. Creative Nonfiction: Researching and Crafting Stories of Real Life.

Hugo, Richard. The Triggering Town: Lectures and Essays on Poetry and Writing.

Kooser, Ted: The Poetry Home Repair Manual: Practical Advice for Beginning Poets.

Kowit, Steve. In the Palm of Your Hand: The Poet’s Portable Workshop.

Lamott, Anne. Bird by Bird: Some Instructions on Writing and Life.

Miller, Brenda and Suzanne Paola. Tell it Slant: Writing and Shaping Creative Nonfiction.

Moore, Dinty W. Crafting the Personal Essay: A Guide for Writing and Publishing Creative Non-fiction.

Rilke, Rainer Maria. Letters to a Young Poet., Stephen Mitchell translation.

Root, Robert L, and Michael J. Steinberg. The Fourth Genre: Contemporary Writers of/on Creative Nonfiction, 5th Edition. 

Slager, Daniel, ed. Views From the Loft: A Portable Writer’s Workshop.

Teachers and Writers collaborative books.  http://www.twc.org

“Art of” Series by Graywolf Press. (Click on “creative writing” link.)

Wooldridge, Susan. Poemcrazy: Freeing Your Life with Words.