bluebook

A blank booklet of lined paper used in the administration of examinations, so named because of its pale blue front and back covers.

A style guide on legal citation.

(law) To format a document, particularly a legal document including citations, according to the rules of the Bluebook, a US style guide.

(roleplaying games) To have players describe, in writing and in-between regular role-playing sessions, character activities that don't involve the entire group.