“Con el alambre viene la hambre,” cited in Juan Mora Torres, The Making of the Mexican Border: The State, Capitalism, and Society in Nuevo León, 1848-1910. Austin: University of Texas Press, 2001, 114
Frances T. McCallum and James Mulkey Owens, “Barbed Wire,” Handbook of Texas Online (http://www.tshaonline.org/handbook/online/articles/aob01), accessed October 01, 2011. Published by the Texas State Historical Association
View of a guard tower and fence at the Buchenwald Concentration Camp, American Jewish Joint Distribution Committee, Holocaust Encyclopedia, United States Holocaust Memorial Museum, (http://www.ushmm.org/wlc/en/media_ph.php?ModuleId=10005198&MediaId=1514), accessed October 1, 2011.