*** The Scene of the Crime: a writer's guide to crime-scene investigations, Anne Windgate, Ph.D, 1992
From the Writer's Digest Howdunit Series, dated, but good. I picked this up in a used bookstore years ago when I was toying with the idea of writing whodunits. I got over it, but never ditched the book. Lots of solid content in here, but if you're writing in this area, you'll need a more current reference book.
Writer's Digest Books are typically very good, like Jim's books on craft, and most of the Howdunit Series books. A book I read a few years ago, Malicious Intent, was a notable exception. So notable that even now, years later, I remember how horrific it was/is, as the reviews at the link show. Fortunately, it's a one-off. He hasn't come out with a series of rantings and unsubstantiated opinions presented as facts. I'd like to hear the story of how that one slipped past the Writer's Digest Books editors.