It does remind me of X-Com as well. Wouldn't surprise me, judging by all of the other references to other games that people have found.
The layout of the room is an homage to Doom, as the doors, slime pits, green armor, and rusty helmet (actually, I think the helmets are a reference to Quake) are all seen in the Doom games. As for the book, it is just flavor text referencing the Doom guy and his Rocket Launcher. However, I think it would be cool if reading the book would open a secret room somewhere that has a bolt of mass destruction, or maybe a named, doom themed item.
