1. Mundo, A.D.N. (2007): México: dos ríos se desbordan dejando 400.000 damnificados. In: ADN Mundo, 31 October. Available from
http://www.adnmundo.com/contenidos/politica/mexico-tabasco-inundaciones-rios-desbordados-lluvias-afectados-pi-311007.html
, 3 June, 2008.
2. Andreas, P. (2000): Border Games: Policing the U.S.–Mexico Divide. Cornell University Press, Ithaca, NY.
3. Calavita, K. (1992): Inside the State: The Bracero Program, Immigration and the INS. Routledge, Chapman and Hall, New York, NY.
4. Campbell, D., and L. Berry (2003): Land Degradation in Mexico: Its Extent and Impact. Commissioned by Global Mechanism with support from the World Bank. Available from
http://www.fao.org/Ag/AGL/swlwpnr/reports/y_lm/z_mx/mx_doc/mxtx511.doc
, 15 June, 2008.
5. COLEF/CONAPO. (2006): Principales Indicadores de los Levantamientos de la EMIF (1993–2003). Available from
http://www.colef.mx/Investigacion/Documentos/Principales%20indicadores%20de%20los%20levantamientos%20de%20la%20EMIF%201993-2003.xls
, 6 June, 2008.