Did you mean: Blue Book
From Comparing New Models to Selling Used Cars, Kelley Blue Book is The One Stop Shop.
The Bluebook: A Uniform System of Citation is a style guide that prescribes the most widely used legal citation system in the United States. It is taught and used at a majority of U.S. law schools and is also used in a majority of federal courts. Wikipedia
Originally published: 1926
Subject: Legal citations