See also the Center for Immigration Studies at http://www.cis.org/. Another necesssary reference is for the Mexican Migratory Project at at opr.princeton.edu that is shared by Princeton and the Universidad de Guadalajara.

Migration News is superb, found at http://migration.ucdavis.edu/index.php

Last but not least is Beyond Smoke and Mirrors by Douglas Massey, Jorge Durand and J Malone that presents a critical history of US immigration laws passed between 1986 and 1996, exploring how these policies have harmed Mexico, the US and the migrants. Massey & Co. assert that since 1986 Mexican migration into the US has evolved from a circular flow of temporary workers into a permanent settlement of migrant workers and their dependents. They find that the massive expansion of the US Border Patrol has not increased the odds of apprehending illegal immigrants. In fact, the number of people caught illegally entering the country is at a 30-year low, and the death rate along the border has tripled in recent years. The crackdown on illegal immigrants has actually encouraged illegal immigrants to remain in the US.