bluebooks

Bluebooks refer to several different kinds of books and reference works. The meaning varies by context.

In education, blue books are small, soft-cover examination booklets used for handwritten responses. They are typically blue or blue-tinted and issued by instructors for timed exams. After a test, the sheets are collected and graded.

The Bluebook: A Uniform System of Citation is a widely used guide for legal citation in the United States. First published in the early 20th century, it provides standardized formats for citing cases, statutes, law review articles, and other legal materials. It is commonly used by law students, courts, attorneys, and academics to ensure consistent citation.

The Kelley Blue Book, commonly known simply as the Blue Book, is a price guide for new and used motor vehicles. It publishes estimated values for private-party sales, trade-ins, and suggested retail prices, and is used by buyers, sellers, and dealers to gauge market value.