Secondary sources are publications that describe, comment on, or analyze the law, while primary sources are publications that contain the actual text of the law.
Examples of secondary sources:
- Legal dictionaries and encyclopedias
- They work like all dictionaries and encyclopedias. Often they are included in services such as Westlaw.
- Law reviews/journals
- They contain legal scholarship created by the academic legal community.
- They are run by law students
- Article essays (called "lead articles") are written by law professors and other legal scholars.
- Student written articles (called "notes" or "comments")
- Both types of articles usually contain footnotes citing primary and secondary sources.
- The footnotes are essential to researches seeking relevant primary authority
- American Law Reports (ALR)
- Secondary source; a combination of a legal encyclopedia and a case reporter
- Articles are called annotations; these articles provide comprehensive coverage of very specific narrow topics
- ALR annotations contain citations to primary sources and also to law review articles
- Annotations for topics covered also provide a review of the current state of the law
- ALR annotations, while very useful, are not considered authoritative sources of the law (think of them as reference materials)
- Easiest way to search ALR is by using Westlaw
- Restatements
- Secondary resource published by The American Law Institute (ALI).
- They cover a variety of fields, and they restate the common law rules as they have developed over time in the majority of U.S. jurisdictions.
- They also include commentary, hypotheticals, and case summaries
- They carry substantial weight as persuasive authority
- Divided into chapters and subdivided into numbered sections statement of the black letter law
- comment (comprehensive explanation)
- illustrations (demonstrate application in hypothetical situations
- reporter's note (contains historical development of the section and includes case law references)
- Restatement volumes in PDF format can be found in HeinOnline
- Treatises
- Comprehensive publication on a single topic, usually written by a law professor, judge, or expert legal practitioner.
- No single standard format. Some are monographs, others come in multivolume sets. Some are updated yearly with pocket parts (supplements), others are loose-leaf binders that are updated more frequently.
- Most treatises don't contain the word "Treatise" in the title, so a law librarian should be consulted when in doubt.
- Treatises collect detailed information on a single legal issue.
- They contain extensive references and citations to primary authority
- They contain analysis of the topic and commentary on the law related to the topic, so they can save a lot of time
- Treatises are only found in print.