In legal research, a citator is a citation index of legal resources, the best-known of which is Shepard's Citations. Given a reference of a legal decision, a citator allows the researcher to find newer documents which cite the original document and thus to reconstruct the judicial history of cases and statutes. Using a citator in this way is colloquially referred to as "Shepardizing".
A publication provided by the Division of Legislative Information Services of the Office of Legislative Services which shows each action taken on every bill filed during a session. The Citator also provides statistical information and a number of useful indices for each session.