Edmund Charles Wendt, M.D., ed. (1885). A treatise on Asiatic cholera. New York: William Wood. p. 79. Retrieved 6 June 2010. brownsville cholera 1849 california emigrants.
Rudy, Alan (1995). "3"(PDF). Environmental Conditions, Negotiations and Crises: The Political Economy of Agriculture in the Imperial Valley of California, 1850-1993 (Ph.D. in Sociology thesis). Retrieved 26 May 2010.