1. Borders and Law Enforcement Remarks by John D Negroponte, Deputy Secretary of State, at the Monterrey Conference Dinner, Monterrey, Mexico ( 2007 ). http://merida.usconsulate.gov/negr0ponteremarks.html
2. Constantine , T 1996 Statement Before the Senate Committee on Banking, Housing and Urban Affairs Regarding Drug Trafficking in Mexico http://www.fas.org/irp/congress/1996_hr/s960328c.htm
3. Mexico's Drug Cartels;Cook;CRS Report to Congress,2007
4. Operation Intercept: The International Politics of Pressure;Craig;The Review of Politics,1980