Which citation style is commonly used in legal documents?

The Bluebook is the standard citation style used in legal documents because it provides comprehensive guidelines specifically for legal writing. This style is designed to help legal professionals accurately cite cases, statutes, legal journals, and other legal materials. The Bluebook ensures uniformity in citations, which is crucial in the legal field as precision and clarity are paramount. This style's specific rules and formats cater to the unique needs of legal practitioners, making it a vital resource in legal education and practice.

In contrast, the other citation styles such as APA, MLA, and Chicago are tailored for disciplines outside of law, focusing mainly on academic writing in fields such as humanities or social sciences. While they are effective for their respective purposes, they lack the legal specificity required for proper legal citation, which is why the Bluebook is the preferred choice for legal documents.