"Instruments of international law applicable to migration."
(International Organization for Migration (IOM), International migration law, Glossary on immigration, 2004, visited 2008-08-06)
"Immigration law establishes rules for the nation's borders and ports of entry, determining who may enter, how long they may stay and when they must leave."
(Legal Information Center, Immigration Law, 1999-2008, visited 2009-08-06)