Much to my surprise, and talk about big surprises, one of my 36 books, Rick Sammon's HDR Photography Secrets for Digital Photographers is free on this site.
Be that as it may . . . if you are new to HDR photography, or if you are looking for an awesome HDR image processing program, you can get a 15% discount on Photomatix, the HDR program I used to process almost all of the images in my book, including the cover, on my Play & Save on Plug-ins page.
I also teach HDR on my workshops.
Explore the light,