I understand that I could read the histories in the book list, but Ideally I would like to read something that specifically targets the common arguments made by deniers, and has a focus on explaining what the sources and the like are. If only because I encounter a couple deniers on various things and it would be easier for me to engage with them if I had a more targeted work I could refer to rather than just a history of it.
Michael Shermer and Alex Grobman's Denying History: Who Says the Holocaust Never Happened and Why Do They Say It? is a survey of deniers.
Good luck engaging Deniers though, it's equivalent to yelling at a brick wall. Denialism thrives off of ahistorical arguments and although many deniers style themselves as historians or skeptics, they are not playing by the evidentiary rules of either.
For in-depth refutations of deniers' claims you have to turn to the internet, not books. Here are some resources:
The Holocaust Controversies blog is engaged in a perpetual fight with deniers. They have published the definite refutation of deniers' claims on the Operation Reinhard Camps here.
Holocaust Denial on Trial: maintained by Emory University, where Deborah Lipstadt teaches. Lipstadt is the academic who was sued by denier David Irving for libel (in the UK), a trial that she won. The website uses many of the trial documents, because the five-year trial turned into something of a "prove the Holocaust happened" thing. If you're interested in the trial itself, Lipstadt has written a book about it: History on Trial: My Day in Court with a Holocaust Denier (2005). The HDOT website is about much more than the trial, though, among other things it has these excellent "Myth/Fact Sheets" that address the main denier talking points.
The Nizkor Project: very 1990s-looking and rather chaotic website but if you persevere you can find excellent resources here.