Unless you are studying the evolution of a particular regulation and need to cite a historical version, use the most recent code edition available. This ensures you’re citing the most up-to-date version of the regulation. Bluebook style cites to the canonical version of the law, not the specific version that you consulted. However, providing the year allows your readers to access the exact wording of the regulation that you used. [5] X Research source
If your instructor or supervisor wants you to include a bibliography or reference list, the format for a CFR citation does not change. However, your instructor or supervisor may want you to include the title of the regulation, or other information, in the full reference.
If you accessed the CFR online, go to the Government Printing Office website at gpo. gov to get a PDF of the print version of the regulation. That way, you’ll have a page number.
If the regulation is commonly known or identified by its name, use that name as the first part of your reference entry. If the regulation’s name isn’t commonly known, you can skip to the next part of the entry if you want.
Named example: (Pets, 2017). Unnamed example: (36 C. F. R. § 2. 15, 2017).