Clark Hubbs. 2005. Personal communication with Clark Hubbs, Professor emeritus, School of Environmental Science, University of Texas, September 7, 2005.
 USFWS. 1984. Big Bend gambusia (Gambusia gaigei) Recovery Plan. U.S Fish and Wildlife Service, Albuquerque, NM.
 Wauer, R. 1997. For All Seasons, A Big Bend Journal. Austin (University of Texas Press).