A rulebook a book containing a set of rules.
Commander William T. Riker asked Jean-Luc Picard "When has justice ever been as simple as a rulebook?" (TNG: "Justice")
When several members of the Maquis living aboard the USS Voyager were forced to undergo Starfleet training by Tuvok in 2371, one member of the Maquis, Kenneth Dalby, complained to their former Maquis leader, Chakotay, that "you know as well as I do that we're used to playing with a different rulebook. There's the Starfleet way, and there's the Maquis way." (VOY: "Learning Curve")