Transborder agglomeration (English Wikipedia)

"Archived copy" (PDF). www.espon.eu. Archived from the original (PDF) on 24 September 2015. Retrieved 12 January 2022.{{cite web}}: CS1 maint: archived copy as title (link)
"Archived copy" (PDF). www.espon.eu. Archived from the original (PDF) on 24 September 2015. Retrieved 12 January 2022.{{cite web}}: CS1 maint: archived copy as title (link)

flybrownsville.com

"Explore Matamoros". Brownsville South Padre Island International Airport. Retrieved 5 February 2024.

"The 411 - Fascinating Facts". Guest Life: El Paso/Juarez and Southern New Mexico. Archived from the original on 28 September 2007. Retrieved 17 Feb 2010.

http://www.lapatilla.com/site/2016/08/15/cucuta-y-san-antonio-dos-ciudades-unidas-pero-separadas-por-cierre-frontera/ "...que une ambas ciudades formando una conurbación, los 650.000 habitantes de Cúcuta y los 50.000 de San Antonio supieron que comenzaban tiempos difíciles."

Gomez, Rodney; Guajardo, Luis; Ely-Ledesma, Edna (June 15, 2022). "It is time to recognize the Rio Grande Valley as a rising borderland metropolis". Rice University: Kinder Institute for Urban Research.{{cite web}}: CS1 maint: multiple names: authors list (link)

"Archived copy" (PDF). www.espon.eu. Archived from the original (PDF) on 24 September 2015. Retrieved 12 January 2022.{{cite web}}: CS1 maint: archived copy as title (link)
"Archived copy" (PDF). www.espon.eu. Archived from the original (PDF) on 24 September 2015. Retrieved 12 January 2022.{{cite web}}: CS1 maint: archived copy as title (link)
"San Diego - Tijuana". World Gazetteer. Archived from the original on 2007-10-01. Retrieved 1 September 2011.
"The 411 - Fascinating Facts". Guest Life: El Paso/Juarez and Southern New Mexico. Archived from the original on 28 September 2007. Retrieved 17 Feb 2010.

"San Diego - Tijuana". World Gazetteer. Archived from the original on 2007-10-01. Retrieved 1 September 2011.
"Nuevo Laredo Metro area". World Gazetteer. Archived from the original on 9 February 2013. Retrieved 1 September 2011.