Soo.... the book has a bit of a history (see the acknowledgements). When I worked with a publisher, "academic" things like a bibliography were somewhat de-emphasized and the tooling was not nearly as nice as, well, BibTeX. So we went for a very short bibliography containing works that were directly quoted. I did read the paper way back when doing research for the first chapters, but over the years the reference got lost and that's the main reason it didn't make it in.

But you're right, it (and many, many, _many_ other things) does belong in the bibliography.