The 19th edition of The Bluebook introduces a few minor changes, and one significant one: it now allows direct citation to commercial databases, including LexisNexis and Westlaw. With this change come challenging new rules and citation forms for commonly-cited authorities. The second edition of Understanding and Mastering The Bluebook thoroughly covers these new electronic citation forms. For each authority, it pulls together rules that are scattered throughout The Bluebook?-?in the Bluepages, Whitepages, and revised tables; provides clear explanations and examples for the new forms; and defines new terms associated with citations to commercial databases. The second edition has all the features of the first edition, plus: Coverage of additional new 19th edition rules that directly impact practitioners' citations; A new chapter with in-depth coverage of federal and state administrative regulations; An expanded discussion of unpublished decisions, including both full and short form citations; Additional examples of correct and incorrect citations, all clearly labeled to identify the citation principle illustrated; More tips to explain background and put rules in context, all designed to help beginners understand citation fundamentals; More warnings to help beginners avoid common citation errors; and Improved cross-referencing for quicker access to related rules and discussions.