The Bluebook is a manual that codifies national citation standards in the legal field. Originally published in 1926, it is periodically updated to reflect new types of authorities cited in legal text and new ideas about how to organize them. The popularity of The Bluebook among law students and professionals has given rise to a new name: "bluebooking." Bluebooking is the process of supporting assertions with citations in proper form.
See generally Introduction to Basic Legal Citation.