It is so named because its cover is blue and because the word "Bluebook" appears on its cover . Delaware's Supreme Court has promulgated rules of citation for unreported cases markedly different from The Bluebook standards, and custom in that state as to the citation format of the Delaware Code also differs from The Bluebook. A mobile version was launched in 2012 within the rulebook app, an app that allows lawyers, scholars, judges, law students, paralegals, and others involved in the legal profession to reference federal and state court rules, codes, and style manuals on iPad and other mobile devices.