Below are some of the library resources that provide the rules of legal citation and assistance in interpreting those rules. The Texas State Law Library has many other resources in addition to the highlights we present below.
This manual from the Association of Legal Writing Directors is written for lawyers, judges, law teachers, and law students and designed to be "easy to use, easy to teach from, and easy to learn from."
This work in the "nutshell" series helps you cite in Bluebook or ALWD form. Numerous appendices help with citation forms in various types of legal writing.