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2. American Federation of Labor-Congress of Industrial Organizations (1991).Exploiting both sides: U.S.-Mexico free trade, position paper. Washington, DC.
3. Bouvier, Leon & Simcox, David (1986).Many hands, few jobs: Population, unemployment and emigration in Mexico and the Caribbean, Washington, D.C:Center for Immigration Studies
4. Briggs, V.M. Jr. (1991). Immigration policy: Political or economic?Challenge, September?October, 1991.
5. Bush, George (May 1, 1991). Letter to Congressional leaders on "Response of the Administration to Issues Raised in Connection with the Negotiation of a North American Free Trade Agreement." Quoted inMexico Business Monthly, June 1991.