The style most commonly used by lawyers and legal scholars.
Introduction to Basic Legal Citation, by Peter Martin of Cornell Law School, is an online beginner's guide to legal citation based on The Bluebook.

This refinement of The Bluebook published by the Association of Legal Writing Directors is more consistent and logical, and includes many more examples. Because it is designed to be a teaching tool and not just a reference work, The ALWD Citation Manual has fuller and clearer explanations, with sidebars that offer advice or call attention to common errors. The ALWD Web site has information about the manual, including an FAQ, a list of schools and publishers that have adopted it, and instructional materials for teachers.

Bluebook-style citations currently require the author to refer to page numbers from the paper publications of a specific vendor, such as West. This system complicates matters when the author wishes to cite the same document (or the reader wishes to consult the same document) as it appears in a different format (e.g., online) or as it has been issued by a different vendor (e.g., LexisNexis). This guide sets out a blueprint for courts that wish to design citation schemes for their own decisions that are not keyed to print format or to any specific publisher’s products, and also includes universal citation formats for statutes and administrative rules. The Citation Format page on the AALL Web site explains public domain citation and provides jurisdiction-specific recommendations for its use.

Popularly referred to as the Maroonbook, this is an attempt to simplify the often obsessively detailed and often arcane rules of The Bluebook. It sets forth very general guidelines and encourages writers to use common sense in applying them to specific situations. The Maroonbook has been around since 1989, but has never quite caught on with lawyers or scholars. Although the Chicago Manual and Turabian list it as a suitable alternative to The Bluebook, virtually no one actually uses it who is not affiliated with the University of Chicago or writing for one of the journals mentioned above.

Sample MLA, APA, and Bluebook citations are provided for selected document types found in LexisNexis® Academic.

Basic guidelines and sample citations for sources in the ProQuest Congressional database. It is not clear what style is being used for the examples, and for any source or format other than ProQuest Congressional (including other online and electronic formats), the user is merely referred to The Complete Guide to Citing Government Information Resources.