- Official Journal of the Federation
www.dof.gob.mx/ - Official Twitter Account of the Confederation of Associations of Customs Agents of the Mexican Republic
https://twitter.com/caaarem?lang=en - Official Page of Foreign Trade of the Ministry of Finance and Public Credit
https://www.sat.gob.mx/personas/comercio-exterior - Page of the Department of Homeland Security of the United States
https://www.cbp.gov