Federal statutes governing immigration law can be found in the United States Code. Title 8 of the United States Code deals with Aliens and Nationality.
United States Code (U.S.C.)
United States Code Annotated (U.S.C.A.)
United States Code Service (U.S.C.S.)
For historical statutory code research, use HeinOnline's United States Code library or FDsys. You may also want to consult Statutes at Large (HeinOnline, Print: Law Library), the federal government's official session laws.
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One of the most important federal statutes governing immigration law is the Immigration and Nationality Act (INA). The INA was initially signed into law in 1952, and has been amended many times since then. The INA is codified at Title 8, U.S.C., §§ 1101-1537. Statutory provisions can be cited as sections of the INA or as United States Code sections. For example INA §247 is the same section as 8 U.S.C. § 1257.