Westlaw and Lexis have topical Immigration libraries.
Westlaw: Home > Practice Areas > Immigration
Includes cases, statutes, court rules, regulations, administrative decisions, secondary source, forms, and more.
Lexis: Home > Practice Area or Industry > Immigration
Cases, statutes, regulations, secondary sources, forms, more.
American Immigration Lawyers Association (AILA)
One-stop immigration law research portal. Contains primary law as well as AILA practice publications.
Primary Law
Statutes
U.S. Code, Title 8. Current immigration and nationality law is primarily found in Title 8 of the U.S. Code.
Immigration and Nationality Act (U.S. Citizenship and Immigration Services)
Statutes are available from the Immigration collections noted above on Westlaw and Lexis.
Regulations
Title 8, Code of Federal Regulations (CFR) and Federal Register (FR).
Administrative Decisions
Citizenship and Immigration Services
Both Westlaw and Lexis have cases and administrative decisions in their Immigration collections noted above. Look for Administrative Decisions or Administrative Materials.
Administrative Decisions under Immigration & Nationality Laws (GPO, 1943-). Available on DOJ website.
Precedent (and indexed) AG/BIA decisions. Includes BIA Interim Decisions. Cited as "I&N Dec."
Attorney General and BIA Precedent Decisions (DOJ website).
Interpreter Releases. Available on Westlaw.
FOIA Reading Room. Collection of unpublished Board of Immigration Appeals decisions.
Immigrant & Refugee Appellate Center. Index / Collection of unpublished BIA decisions.