Brandt, Nancy. October 1964. Pancho Villa: The Making of a Modern Legend. The Americans, Vol. 21, No. 2. pp.146-162.
Haley, Edward. 1970. Revolution and Intervention: The Diplomacy of Taft and Wilson in Mexico. Cambridge, MA: The MIT Press.
Howell, Jeff. Evaluating the Many Faces of Pancho Villa, Outlaw, Hero, Patriot, Cutthroat. Historical Text Archive. On the internet at http://historicaltextarchive.com/sections.php?op=viewarticle&artid=735
Sandos, James. 1970. German Involvement in Northern Mexico, 1915-1916: A New Look at the Columbus Raid. The Hispanic-American Historical Review