If you found your reference in an academic database (like Proquest Congressional Publications, or Hein Online), the database URL is not included.
If you found your reference on the open web (for example, govinfo.gov, add the DOI (or, if a DOI is not available, the URL), after the final period.
See page 296 of the Publication Manual of the American Psychological Association, (2020) for more information.
Note: The C.F.R. is organized by titles, chapters, parts, and sections. The Publication Manual of the American Psychological Association provides an example of citing to a specific section, using the section symbol. If you are citing to the entire part, you may wish to use the The Bluebook guidelines, by adding pt. or pts. Chapters are not included in citations.
Regulation published in the Code of Federal Regulations (C.F.R.):
Regulation that has appeared in the Federal Register as a Final Rule but has not yet been published in the Code of Federal Regulations:
Provide the title or number (or other descriptive information) and the date published.
Explanation: The official posting of this new rule appears on page 73355 of the 78th volume of the Federal Register, affecting parts 1710, 1717, et. al. in the Code of Federal Regulations. The Federal Register does not point to specific sections of the parts.
Regulation proposed in the Federal Register for comments.
Note: It is generally permissible to shorten long titles when included in a parenthetical reference. The important point is to lead your reader to the location of the reference in the reference list.
Endangered and Threatened Species; Critical Habitat for the Threatened Indo-Pacific Corals, 85 F.R. 76262 (proposed November 27, 2020) (to be codified at 50 C.F.R. pts. 223, 226). https://www.govinfo.gov/app/details/FR-2020-11-27/2020-21226