Law librarians have created numerous online guides for conducting U.S. legal research. Some are very general while others are specific to a particular area of law. To find these guides just conduct a Google search for your topic and the terms "US legal research guide".
Below are some guides that may help in your research:
The following books contain valuable information for how to conduct U.S. legal research:
These books contain bibliographies that will help you locate legal topics, relevant journal and book titles, and annotated lists of significant treatises/texts: