Ballou, Jonathan D., Lees, Caroline, Faust, Lisa J., Long, Sarah, Lynch, Colleen, Bingaman Lackey, Laurie, and Foose, Thomas J. 2010. "Demographic and genetic management of captive populations." in Wild mammals in captivity: principles and techniques for zoo management, edited by Kirk Baer, Charlotte., 219–252. Chicago & London: The University of Chicago Press.