Simberloff, D., J.A. Farr, J. Cox, and D.W. Mehlman. Stein, B.A., T. Breden, and R. Warner. Significance of federal lands for endangered species. Pages 398-401 in E.T. LaRoe, ed. D.C. Taylor, P.D., L. Fahrig, K. Henein, and G. Merriam. 1993.
Connectivity is a vital element of landscape structure.
J.M. Scott, P. H. Hayward, and B. Griffith. 1993. U.S. Department of the Interior. Endangered Species Bulletin Volume 22, No. 2. U.S. Fish and Wildlife Service. Red-cockaded Woodpecker Recovery Plan.