Matthews, Matt M. (2007), The US Army on the Mexican Border: A Historical Perspective(PDF), The Long War Series: Occasional Paper 22, Fort Leavenworth, Kansas: Combined Arms Research Library: Combat Studies Institute Press – United States Army Combined Arms Center, pp. 48–51, ISBN978-0-16-078903-8, archived from the original(Adobe Acrobat - *.PDF) on October 13, 2011
Matthews, Matt M. (2007), The US Army on the Mexican Border: A Historical Perspective(PDF), The Long War Series: Occasional Paper 22, Fort Leavenworth, Kansas: Combined Arms Research Library: Combat Studies Institute Press – United States Army Combined Arms Center, pp. 48–51, ISBN978-0-16-078903-8, archived from the original(Adobe Acrobat - *.PDF) on October 13, 2011
"AFI's 10 Top 10 Nominees"(PDF). Archived from the original on July 16, 2011. Retrieved August 19, 2016.{{cite web}}: CS1 maint: bot: original URL status unknown (link)