I just finished two small books for writers. Both are based on popular classes I’ve taught. The first is Finish Your Book, a short guide (about 25 pages) that offers tips and guidance for overcoming the stumbling blocks that keep you from finishing that novel you started last year. The other is Write Your Book Proposal, a slightly longer piece (about 35 pages) on putting together a proposal for a nonfiction book. Both links will lead you to the Kindle edition. Both also have paperback versions, here and here. It always takes Amazon a while to link the two together.
Hope you find these helpful!