I highly recommend both Wolfenstein3D and Doom black books, from Fabien Sanglard, which are very technical and describe really well a ton of things around those games: how they have been developed, the tools they have been developed on / with, the context, ...
What I did not like about them was you could either buy a google book (only readable via a google app) or as a free but bitmapped Pdf, so bloated that it used to crash my iPad. I did not mind paying, but would like to get some more flexible format.
Their current Google Book is listed as DRM free[0]. Is that still restricted to only be downloadable in the Google app, or does that mean I could buy it and just download from the Google Play website itself as an EPUB?