McDiarmid, Roy W., Reynolds, Robert P., and Crombie, Ronald I. 1996. "
Permits." In
Measuring and Monitoring Biological Diversity: Standard Methods For Mammals. Wilson, Don E., Cole, F. Russell, Nichols, J. D., Rudram, R., and Foster, Mercedes S., editors. 68–69. Washington, D.C.: Smithsonian Institution Press.