Unless you are an expert in this area of law, or already have a citation to a specific document, it is probably a good idea to begin your research with a treatise, journal article, or other secondary source. These can provide citations to primary authorities and explain how they fit together. Once you have citations to some primary authorities, you should complete your research by updating them, making sure the cited cases have not been overruled, or the statutes repealed.
II. Treatises
For a list of relevant agency websites, see the section on Agency Regulations. The web sites below may also be useful to you: