Maxine Hong Kingston: To Be the Poet (The William E. Massey Sr. Lectures in the History of American Civilization)
A treasure from a writer who is a treasure.
William Packard: The Poet's Dictionary : A Handbook of Prosody and Poetic Devices
The only one you really need. Filled with examples for each entry.
William Packard: The Art of Poetry Writing : A Guide For Poets, Students, & Readers
The closest thing to having been in Packard's class.