Legal citations help the reader of a particular document find a document mentioned through a standard format and set of abbreviations. It is important to use the standard methods of citation, especially when submitting a filing to a court of law.
Here are two legal citation books online:
Proper citation format of the Code of Federal Regulations includes the year.
40 C.F.R. §470.5(a) (2010).
Proper citation format of the Federal Register includes the date it was published.
85 Fed. Reg. 47245 (June 11, 2021).
For more information see Chapter 19 of the ALWD.