My comprehensive Nikon D5600 book is out. A limited number of books defaced with my personal autograph can be purchased from www.laserfairepress.com.
You can buy unautographed copies, ebook versions, and ebook/print bundles from Rocky Nook.

My Nikon D750 book is out of print, but you can purchase a PDF copy of the original book, or a full-color printed copy of the second edition, now a Fast Track Guide, from www.laserfairepress.com.